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Subject: In defense of Boris Gulko

Author: Dann Corbit

Date: 15:56:15 03/20/02


Here is some 3 minute crafty analysis of the pivotal part of the game.  The move
in the EPD record marked as 'bm' is actually the move that was played (whatever
that was).  Sometimes, it should clearly be the 'am' ;-).

[D]r7/pb1qbkp1/1pn1pn1p/8/3P1B2/2P2B2/PP4PP/R2Q1RK1 w - - acd 11; acn 92587079;
acs 181; bm Qe2; ce -48; pv Qe2 a5 Rf2 Ba6 Qe3 Rf8 Re1 Bc4 b3 Nd5 Qe4 Nxf4 bxc4;

              time surplus   0.00  time limit 3:00 (3:00)
         nss  depth   time  score   variation (1)
                6     0.27  -0.72   1. Qe1 Kg8 2. Qg3 Ba6 3. Bxh6 Bxf1
                                    4. Rxf1
                6     0.59  -0.55   1. b4 g5 2. Be5 Rf8 3. Bxf6 Bxf6 4.
                                    Qe2
                6->   0.77  -0.55   1. b4 g5 2. Be5 Rf8 3. Bxf6 Bxf6 4.
                                    Qe2
                7     1.16  -0.82   1. b4 Ke8 2. b5 Na5 3. Qe2 Kd8 4. Rae1
                7     1.65  -0.71   1. Qe1 Rf8 2. Qg3 g5 3. Be5 Kg8 4.
                                    Bf4
                7     3.99  -0.62   1. Qe2 a5 2. Qe1 Bd6 3. Qg3 Bxf4 4.
                                    Qxf4 Rf8
                7->   4.24  -0.62   1. Qe2 a5 2. Qe1 Bd6 3. Qg3 Bxf4 4.
                                    Qxf4 Rf8
                8     5.70  -0.59   1. Qe2 a5 2. Qb5 Nxd4 3. Bh5+ g6 4.
                                    Qxd7 Nxd7 5. Bxh6+ Bf6 6. Bg4
                8->   8.26  -0.59   1. Qe2 a5 2. Qb5 Nxd4 3. Bh5+ g6 4.
                                    Qxd7 Nxd7 5. Bxh6+ Bf6 6. Bg4
                9    13.73  -0.48   1. Qe2 Kg8 2. Rae1 Bc8 3. Bg3 a5 4.
                                    Qf2 Ba6 5. Be2
                9->  15.65  -0.48   1. Qe2 Kg8 2. Rae1 Bc8 3. Bg3 a5 4.
                                    Qf2 Ba6 5. Be2
               10    30.84  -0.46   1. Qe2 Rf8 2. Rae1 Bc8 3. Bg4 Nd8 4.
                                    Rf2 Kg8 5. Bf5 Bd6
               10->   1:12  -0.46   1. Qe2 Rf8 2. Rae1 Bc8 3. Bg4 Nd8 4.
                                    Rf2 Kg8 5. Bf5 Bd6
               11     2:14  -0.48   1. Qe2 a5 2. Rf2 Ba6 3. Qe3 Rf8 4.
                                    Re1 Bc4 5. b3 Nd5 6. Qe4 Nxf4 7. bxc4
              time=3:00  cpu=99%  mat=0  n=92587079  fh=94%  nps=513k
              ext-> chk=3807879 cap=232635 pp=4590 1rep=205933 mate=5001
              predicted=0  nodes=92587079  evals=20997455
              endgame tablebase-> probes done=0  successful=0

[D]r7/pb1qbkp1/1pn1pn1p/8/3P1B2/2P2B2/PP2Q1PP/R4RK1 b - - acd 12; acn 93338572;
acs 182; bm Re8; ce -6; pv a5 Qf2 Kg8 Qg3 Kh8 Bc7 b5 a4 bxa4 Rxa4 Nd5 Bf4 Nxf4
Qxf4;

              time surplus   0.00  time limit 3:00 (3:00)
         nss  depth   time  score   variation (1)
                6     0.61   0.08   1. ... a5 2. Qe1 Ba6 3. Rf2 Kg8 4.
                                    Qe3
                6->   0.63   0.08   1. ... a5 2. Qe1 Ba6 3. Rf2 Kg8 4.
                                    Qe3
                7     1.77   0.01   1. ... a5 2. Qf2 Kg8 3. Qg3 Ba6 4.
                                    Bxh6 Bxf1 <HT>
                7->   1.85   0.01   1. ... a5 2. Qf2 Kg8 3. Qg3 Ba6 4.
                                    Bxh6 Bxf1 <HT>
                8     4.24   0.29   1. ... a5 2. Rf2 Ba6 3. Qe3 Kg8 4.
                                    Bc7 Nd5 5. Bxd5 exd5 6. Bxb6
                8     5.26   0.24   1. ... Kg8 2. Rae1 Bc8 3. Bg3 a5 4.
                                    Rf2 Bd6 5. Ref1 Bxg3 6. hxg3
                8->   7.47   0.24   1. ... Kg8 2. Rae1 Bc8 3. Bg3 a5 4.
                                    Rf2 Bd6 5. Ref1 Bxg3 6. hxg3
                9     8.94   0.51   1. ... Kg8 2. Rae1 Nd5 3. Bg3 Bc8 4.
                                    Bh5 Nf6 5. Bg6 Bd6
                9    22.62   0.19   1. ... a5 2. Rf2 Ba6 3. Qe3 Kg8 4.
                                    Bc7 Bd8 5. Be5 Be7
                9->  23.70   0.19   1. ... a5 2. Rf2 Ba6 3. Qe3 Kg8 4.
                                    Bc7 Bd8 5. Be5 Be7
               10    56.71   0.12   1. ... a5 2. Rf2 Ba6 3. Qc2 Rc8 4.
                                    Rd1 Nb4 5. Qb1 Nbd5 6. Qc1 Nxf4 7.
                                    Qxf4
               10->   1:01   0.12   1. ... a5 2. Rf2 Ba6 3. Qc2 Rc8 4.
                                    Rd1 Nb4 5. Qb1 Nbd5 6. Qc1 Nxf4 7.
                                    Qxf4
               11     2:05   0.06   1. ... a5 2. Qf2 Kg8 3. Qg3 Kh8 4.
                                    Bc7 b5 5. a4 bxa4 6. Rxa4 Nd5 7. Bf4
                                    Nxf4 8. Qxf4
               11->   2:27   0.06   1. ... a5 2. Qf2 Kg8 3. Qg3 Kh8 4.
                                    Bc7 b5 5. a4 bxa4 6. Rxa4 Nd5 7. Bf4
                                    Nxf4 8. Qxf4
              time=3:00  cpu=100%  mat=0  n=93338572  fh=95%  nps=517k
              ext-> chk=4067482 cap=189266 pp=6130 1rep=227920 mate=3186
              predicted=0  nodes=93338572  evals=20428460
              endgame tablebase-> probes done=0  successful=0

[D]4r3/pb1qbkp1/1pn1pn1p/8/3P1B2/2P2B2/PP2Q1PP/R4RK1 w - - acd 11; acn 93685390;
acs 182; bm Bh5+; ce -18; pv Rae1 Bc8 Bh5+ g6 Bf3 Kg7 Qe3 g5 Bg3 Kg8 Qf2;

              time surplus   0.00  time limit 3:00 (3:00)
         nss  depth   time  score   variation (1)
                5->   0.23  -0.04   1. Rae1 Rf8 2. b3 Bd6 3. Bg4 Bxf4 4.
                                    Rxf4
                6     0.35  -0.04   1. Rae1 Rf8 2. b3 Bd6 3. Bg4 Bxf4 4.
                                    Rxf4
                6->   0.70  -0.04   1. Rae1 Rf8 2. b3 Bd6 3. Bg4 Bxf4 4.
                                    Rxf4
                7     1.26   0.00   1. Rae1 Rf8 2. b3 Bd6 3. Bg4 Nd8 4.
                                    a4 Bxf4 5. Rxf4
                7->   2.62   0.00   1. Rae1 Rf8 2. b3 Bd6 3. Bg4 Nd8 4.
                                    a4 Bxf4 5. Rxf4
                8     5.72  -0.15   1. Rae1 Bc8 2. Bh5+ g6 3. Bf3 g5 4.
                                    Bh5+ Nxh5 5. Qxh5+ Kg7 6. Be5+ Nxe5
                                    7. Rxe5
                8->  12.19  -0.15   1. Rae1 Bc8 2. Bh5+ g6 3. Bf3 g5 4.
                                    Bh5+ Nxh5 5. Qxh5+ Kg7 6. Be5+ Nxe5
                                    7. Rxe5
                9    17.24  -0.13   1. Rae1 Bc8 2. Qc4 Nd8 3. Rf2 Kg8 4.
                                    Ref1 Rf8 5. Be5
                9->  32.76  -0.13   1. Rae1 Bc8 2. Qc4 Nd8 3. Rf2 Kg8 4.
                                    Ref1 Rf8 5. Be5
               10    43.12  -0.18   1. Rae1 Bc8 2. Bh5+ g6 3. Bf3 Kg7 4.
                                    Qe3 g5 5. Bg3 Kg8 6. Qf2
               10->   1:39  -0.18   1. Rae1 Bc8 2. Bh5+ g6 3. Bf3 Kg7 4.
                                    Qe3 g5 5. Bg3 Kg8 6. Qf2
              time=3:00  cpu=100%  mat=0  n=93685390  fh=94%  nps=519k
              ext-> chk=5289176 cap=231237 pp=5595 1rep=295726 mate=5116
              predicted=0  nodes=93685390  evals=17011374
              endgame tablebase-> probes done=0  successful=0

[D]4r3/pb1qbkp1/1pn1pn1p/7B/3P1B2/2P5/PP2Q1PP/R4RK1 b - - acd 12; acn 97816102;
acs 181; bm g6; ce -70; pv g6 Bg4 h5 Bh3 Nd8 Bg5 Kg7 Qe5 Rf8 a4 a5 b3;

              time surplus   0.00  time limit 3:00 (3:00)
         nss  depth   time  score   variation (1)
                6->   0.21   0.00   1. ... Nxh5 2. Qxh5+ Kg8 3. Bxh6 gxh6
                                    4. Qg6+ Kh8 5. Qxh6+ Kg8 6. Qg6+ Kh8
                                    7. Qh6+
                7     0.51   0.00   1. ... Nxh5 2. Qxh5+ Kg8 3. Bxh6 gxh6
                                    4. Qg6+ Kh8 5. Qxh6+ Kg8 6. Qg6+ Kh8
                                    7. Qh6+
                7->   0.55   0.00   1. ... Nxh5 2. Qxh5+ Kg8 3. Bxh6 gxh6
                                    4. Qg6+ Kh8 5. Qxh6+ Kg8 6. Qg6+ Kh8
                                    7. Qh6+
                8     1.51   0.00   1. ... Nxh5 2. Qxh5+ Kg8 3. Bxh6 gxh6
                                    4. Qg6+ Kh8 5. Qxh6+ Kg8 6. Qg6+ Kh8
                                    7. Qh6+
                8->   1.61   0.00   1. ... Nxh5 2. Qxh5+ Kg8 3. Bxh6 gxh6
                                    4. Qg6+ Kh8 5. Qxh6+ Kg8 6. Qg6+ Kh8
                                    7. Qh6+
                9     1.77     --   1. ... Nxh5
                9    11.21   0.89   1. ... Nxh5 2. Qxh5+ Kg8 3. Bxh6 Rf8
                                    4. Qg4 Bf6 5. Rae1 Ba6 6. Rf2 <HT>
                9    18.97   0.35   1. ... g6 2. Bf3 Kg7 3. Qe3 g5 4. Be5
                                    Nxe5 5. Bxb7 Nfg4
                9->  19.01   0.35   1. ... g6 2. Bf3 Kg7 3. Qe3 g5 4. Be5
                                    Nxe5 5. Bxb7 Nfg4
               10    34.66   0.26   1. ... g6 2. Bg4 Nxg4 3. Qxg4 Kg7 4.
                                    Rae1 Bd8 5. Rf2 Qd5 6. Ref1 Qxa2
               10->  35.04   0.26   1. ... g6 2. Bg4 Nxg4 3. Qxg4 Kg7 4.
                                    Rae1 Bd8 5. Rf2 Qd5 6. Ref1 Qxa2
               11    40.94     --   1. ... g6
               11     1:25   0.66   1. ... g6 2. Bg4 h5 3. Bh3 Nd8 4. Bh6
                                    Qd5 5. Rf3 Kg8 6. Raf1 Ne4
               11->   1:27   0.66   1. ... g6 2. Bg4 h5 3. Bh3 Nd8 4. Bh6
                                    Qd5 5. Rf3 Kg8 6. Raf1 Ne4
               12     2:27   0.70   1. ... g6 2. Bg4 h5 3. Bh3 Nd8 4. Bg5
                                    Kg7 5. Qe5 Rf8 6. a4 a5 7. b3
              time=3:00  cpu=100%  mat=0  n=97816102  fh=95%  nps=542k
              ext-> chk=5970548 cap=152919 pp=22433 1rep=375198 mate=9299
              predicted=0  nodes=97816102  evals=13798611
              endgame tablebase-> probes done=0  successful=0

Up to here, we are basically even and playing according to plan -- black even
has a slight edge according to a short search by Crafty:

[D]4r3/pb1qbk2/1pn1pnpp/7B/3P1B2/2P5/PP2Q1PP/R4RK1 w - - acd 12; acn 98664958;
acs 182; bm Bg4; ce -19; pv Bg4 h5 Bh3 Nd8 Be5 Rf8 Rf4 Kg8 Raf1 Nd5 Rxf8+ Bxf8
Qf2 Bd6;

              time surplus   0.00  time limit 3:00 (3:00)
         nss  depth   time  score   variation (1)
                5->   0.19   0.05   1. Bf3 Kg7 2. Qe3 g5 3. Bg3
                6     0.24  -0.13   1. Bf3 Kg7 2. Rae1 g5 3. Bg3 Bd6
                6->   0.45  -0.13   1. Bf3 Kg7 2. Rae1 g5 3. Bg3 Bd6
                7     0.64  -0.34   1. Bf3 Kg7 2. Rae1 Nd5 3. Bg3 Bg5 4.
                                    Qf2
                7->   1.60  -0.34   1. Bf3 Kg7 2. Rae1 Nd5 3. Bg3 Bg5 4.
                                    Qf2
                8     2.86  -0.31   1. Bf3 g5 2. Be5 Kg7 3. Rae1 Nxe5 4.
                                    Bxb7 Neg4
                8->   5.74  -0.31   1. Bf3 g5 2. Be5 Kg7 3. Rae1 Nxe5 4.
                                    Bxb7 Neg4
                9     8.77  -0.18   1. Bf3 Kg7 2. Rae1 Bc8 3. Qe3 g5 4.
                                    Bg3 Kg8 5. Qf2
                9->  14.49  -0.18   1. Bf3 Kg7 2. Rae1 Bc8 3. Qe3 g5 4.
                                    Bg3 Kg8 5. Qf2
               10    19.46  -0.34   1. Bf3 Kg7 2. Rae1 Nd5 3. Qxe6 Qxe6
                                    4. Rxe6 Nxf4 5. Bxc6 Ne2+ 6. Kh1 Bxc6
                                    7. Rxc6
               10    45.66   0.04   1. Bg4 Rh8 2. Bh3 Nd8 3. Rae1 Qc6 4.
                                    Rf3 Kg7 5. Ref1 Rf8
               10->  50.74   0.04   1. Bg4 Rh8 2. Bh3 Nd8 3. Rae1 Qc6 4.
                                    Rf3 Kg7 5. Ref1 Rf8
               11     1:24  -0.10   1. Bg4 h5 2. Bh3 Nd8 3. Be5 Rf8 4.
                                    Rf4 Kg8 5. Raf1 Nd5 6. Rxf8+ Bxf8 7.
                                    Qf2
               11->   2:01  -0.10   1. Bg4 h5 2. Bh3 Nd8 3. Be5 Rf8 4.
                                    Rf4 Kg8 5. Raf1 Nd5 6. Rxf8+ Bxf8 7.
                                    Qf2
               12     2:42  -0.19   1. Bg4 h5 2. Bh3 Nd8 3. Be5 Rf8 4.
                                    Rf4 Kg8 5. Raf1 Nd5 6. Rxf8+ Bxf8 7.
                                    Qf2 Bd6
              time=3:00  cpu=99%  mat=0  n=98664958  fh=95%  nps=546k
              ext-> chk=5365400 cap=166966 pp=22603 1rep=238357 mate=9685
              predicted=0  nodes=98664958  evals=15107803
              endgame tablebase-> probes done=0  successful=0

Here is the fatal mistake --> h5 should be the move instead of Nxg4 which should
really be the 'am' for sure.  It is fairly difficult to avoid Nxg4.

[D]4r3/pb1qbk2/1pn1pnpp/8/3P1BB1/2P5/PP2Q1PP/R4RK1 b - - acd 12; acn 96653046;
acs 182; bm Nxg4; ce -62; pv h5 Bh3 Nd8 Rae1 Kg7 Be5 Rf8 Rf2 Kg8 Qd3 Qe8 Qf1;

             time surplus   0.00  time limit 3:00 (3:00)
         nss  depth   time  score   variation (1)
                6->   0.25  -0.03   1. ... Nxg4 2. Qxg4 Kg7 3. Rae1 Ba6
                                    4. Rf3 Bc4
                7     0.43   0.26   1. ... Nxg4 2. Qxg4 Kg7 3. Rae1 Bc8
                                    4. Rf3 e5 5. Qxd7 Bxd7 6. dxe5
                7->   0.71   0.26   1. ... Nxg4 2. Qxg4 Kg7 3. Rae1 Bc8
                                    4. Rf3 e5 5. Qxd7 Bxd7 6. dxe5
                8     1.25   0.26   1. ... Nxg4 2. Qxg4 Kg7 3. Rae1 Bd8
                                    4. Rf2 Qd5 5. Ref1 Qxa2
                8->   2.05   0.26   1. ... Nxg4 2. Qxg4 Kg7 3. Rae1 Bd8
                                    4. Rf2 Qd5 5. Ref1 Qxa2
                9     2.87     --   1. ... Nxg4
                9     9.71   1.21   1. ... Nxg4 2. Qxg4 Rg8 3. Bxh6+ Ke8
                                    4. Rae1 Bc8 5. Bg5 Kd8 6. Bxe7+ Qxe7
                                    7. Qf4 Rh8
                9    18.75   0.71   1. ... Rh8 2. Rae1 Nd8 3. Bf3 Kg7 4.
                                    Bxb7 Qxb7 5. Qf2 Qd5 6. b3
                9    24.91   0.66   1. ... h5 2. Bh3 Nd8 3. Bh6 Qd5 4.
                                    Rf3 Kg8 5. Raf1 Ne4
                9->  25.58   0.66   1. ... h5 2. Bh3 Nd8 3. Bh6 Qd5 4.
                                    Rf3 Kg8 5. Raf1 Ne4
               10    33.37   0.70   1. ... h5 2. Bh3 Nd8 3. Bg5 Kg7 4.
                                    Qe5 Rf8 5. a4 a5 6. b3
               10->  48.30   0.70   1. ... h5 2. Bh3 Nd8 3. Bg5 Kg7 4.
                                    Qe5 Rf8 5. a4 a5 6. b3
               11     1:14   0.59   1. ... h5 2. Bh3 Nd8 3. Be5 Rf8 4.
                                    Rf4 Kg8 5. Raf1 Nd5 6. Rxf8+ Bxf8 7.
                                    Qf2 Bd6
               11->   1:27   0.59   1. ... h5 2. Bh3 Nd8 3. Be5 Rf8 4.
                                    Rf4 Kg8 5. Raf1 Nd5 6. Rxf8+ Bxf8 7.
                                    Qf2 Bd6
               12     2:17   0.62   1. ... h5 2. Bh3 Nd8 3. Rae1 Kg7 4.
                                    Be5 Rf8 5. Rf2 Kg8 6. Qd3 Qe8 7. Qf1
              time=3:00  cpu=100%  mat=0  n=96653046  fh=95%  nps=536k
              ext-> chk=4171825 cap=189476 pp=19455 1rep=195637 mate=11931
              predicted=0  nodes=96653046  evals=18470423
              endgame tablebase-> probes done=0  successful=0

Black is now on the ropes, but look how deep of a search is needed to see that:
[D]4r3/pb1qbk2/1pn1p1pp/8/3P1Bn1/2P5/PP2Q1PP/R4RK1 w - - acd 12; acn 95894324;
acs 181; bm Qxg4; ce -16; pv Qxg4 Rg8 Rae1 Bc8 b4 Kg7 Re3 b5 Rh3 Rh8 Rhf3;

              time surplus   0.00  time limit 3:00 (3:00)
         nss  depth   time  score   variation (1)
                6->   0.23  -0.78   1. Qxg4 Kg7 2. Rae1 Ba6 3. Rf2 Bc4
                7     0.34  -0.46   1. Qxg4 Kg7 2. Rae1 Bc8 3. Rf3 Qd5
                                    4. b3
                7->   0.65  -0.46   1. Qxg4 Kg7 2. Rae1 Bc8 3. Rf3 Qd5
                                    4. b3
                8     0.89  -0.50   1. Qxg4 Kg7 2. Rae1 Bc8 3. Re3 h5 4.
                                    Qf3 Kg8
                8->   1.58  -0.50   1. Qxg4 Kg7 2. Rae1 Bc8 3. Re3 h5 4.
                                    Qf3 Kg8
                9     3.14     ++   1. Qxg4!!
                9     8.07   0.36   1. Qxg4 Rg8 2. Rae1 Ke8 3. Qxe6 Qxe6
                                    4. Rxe6 Kd7 5. d5 g5 6. Be3
                9->   9.50   0.36   1. Qxg4 Rg8 2. Rae1 Ke8 3. Qxe6 Qxe6
                                    4. Rxe6 Kd7 5. d5 g5 6. Be3
               10    16.87   0.58   1. Qxg4 Rg8 2. d5 Qxd5 3. c4 Qd7 4.
                                    Rad1 Qc8 5. Bxh6+ Bf6 6. Rd6
               10->  19.39   0.58   1. Qxg4 Rg8 2. d5 Qxd5 3. c4 Qd7 4.
                                    Rad1 Qc8 5. Bxh6+ Bf6 6. Rd6
               11    28.47     --   1. Qxg4
               11    50.66  -0.16   1. Qxg4 Rg8 2. Rae1 Bc8 3. b4 Kg7 4.
                                    Re3 b5 5. Rh3 Rh8 6. Rhf3
               11->   1:00  -0.16   1. Qxg4 Rg8 2. Rae1 Bc8 3. b4 Kg7 4.
                                    Re3 b5 5. Rh3 Rh8 6. Rhf3
               12     1:19     ++   1. Qxg4!!
              time=3:00  cpu=99%  mat=-3  n=95894324  fh=94%  nps=531k
              ext-> chk=5229426 cap=160130 pp=14165 1rep=371824 mate=25289
              predicted=0  nodes=95894324  evals=19080381
              endgame tablebase-> probes done=0  successful=0

It's all over now but the shouting:
[D]4r3/pb1qbk2/1pn1p1pp/8/3P1BQ1/2P5/PP4PP/R4RK1 b - - acd 12; acn 94898151; acs
182; bm Kg7; ce -225; pv Rg8 d5 Qxd5 Rad1 Qxa2 c4 Rg7 Bxh6+ Kg8 Bxg7 Kxg7 Rd7
Bc8;

             time surplus   0.00  time limit 3:00 (3:00)
         nss  depth   time  score   variation (1)
                7     0.32   0.26   1. ... Kg7 2. Rae1 Bd8 3. Rf2 Qd5 4.
                                    Ref1 Qxa2
                7->   0.37   0.26   1. ... Kg7 2. Rae1 Bd8 3. Rf2 Qd5 4.
                                    Ref1 Qxa2
                8     1.07     --   1. ... Kg7
                8     1.86   2.31   1. ... Kg7 2. Bxh6+ Kh8 3. Rf7 Rg8
                                    4. Raf1 Nd8 5. R7f2 Bd5
                8     4.83   1.21   1. ... Rg8 2. Bxh6+ Ke8 3. Rae1 Bc8
                                    4. Bg5 Kd8 5. Bxe7+ Qxe7 6. Qf4 Rh8
                8->   4.90   1.21   1. ... Rg8 2. Bxh6+ Ke8 3. Rae1 Bc8
                                    4. Bg5 Kd8 5. Bxe7+ Qxe7 6. Qf4 Rh8
                9     8.28   1.51   1. ... Rg8 2. d5 Qxd5 3. c4 Qd7 4.
                                    Rad1 Qc8 5. Bxh6+ Bf6 6. Rd6
                9->   9.22   1.51   1. ... Rg8 2. d5 Qxd5 3. c4 Qd7 4.
                                    Rad1 Qc8 5. Bxh6+ Bf6 6. Rd6
               10    15.89   1.48   1. ... Rg8 2. d5 Qxd5 3. c4 Qh5 4.
                                    Be5+ Ke8 5. Qxe6 Rf8 6. Rxf8+ Kxf8
                                    7. Rf1+ Ke8 8. Bf6
               10->  17.02   1.48   1. ... Rg8 2. d5 Qxd5 3. c4 Qh5 4.
                                    Be5+ Ke8 5. Qxe6 Rf8 6. Rxf8+ Kxf8
                                    7. Rf1+ Ke8 8. Bf6
               11    49.78   1.18   1. ... Rg8 2. d5 Qxd5 3. c4 Qd7 4.
                                    Rad1 Qc8 5. Bxh6+ Ke8 6. Qf4 Bc5+ 7.
                                    Kh1 Rh8
               11->  52.04   1.18   1. ... Rg8 2. d5 Qxd5 3. c4 Qd7 4.
                                    Rad1 Qc8 5. Bxh6+ Ke8 6. Qf4 Bc5+ 7.
                                    Kh1 Rh8
               12    56.94     --   1. ... Rg8
               12     1:36   2.25   1. ... Rg8 2. d5 Qxd5 3. Rad1 Qxa2
                                    4. c4 Rg7 5. Bxh6+ Kg8 6. Bxg7 Kxg7
                                    7. Rd7 Bc8
              time=3:00  cpu=100%  mat=0  n=94898151  fh=94%  nps=525k
              ext-> chk=4607873 cap=164006 pp=21210 1rep=295028 mate=30465
              predicted=0  nodes=94898151  evals=20474690
              endgame tablebase-> probes done=0  successful=0

[D]4r3/pb1qb1k1/1pn1p1pp/8/3P1BQ1/2P5/PP4PP/R4RK1 w - - acd 13; acn 106493706;
acs 182; bm Bxh6+; ce 423; pv Bxh6+ Kh8 Rf7 Ne5 Bg7+ Kg8 Bxe5 Kxf7 Rf1+ Bf6 Qg5
Rg8 Rxf6+ Ke8 Qe3;

              time surplus   0.00  time limit 3:00 (3:00)
         nss  depth   time  score   variation (1)
                6->   0.29  -0.56   1. Rae1 Bc8 2. Rf2 Qd5 3. Ref1 Qxa2
                7     0.90  -0.56   1. Rae1 Bd6 2. Rf3 Ba6 3. b3 Bb5 4.
                                    Bxd6 Qxd6
                7     1.29     ++   1. Bxh6+!!
                7     2.00   1.41   1. Bxh6+ Kh8 2. Rf7 Rg8 3. Raf1 Nd8
                                    4. R7f2 Bd5
                7->   2.06   1.41   1. Bxh6+ Kh8 2. Rf7 Rg8 3. Raf1 Nd8
                                    4. R7f2 Bd5
                8     2.19     ++   1. Bxh6+!!
                8     3.27   4.61   1. Bxh6+ Kh8 2. Qxg6 Rg8 3. Qh5 Qe8
                                    4. Rf7 Rxg2+ 5. Kh1 Qxf7 6. Qxf7
                8->   3.33   4.61   1. Bxh6+ Kh8 2. Qxg6 Rg8 3. Qh5 Qe8
                                    4. Rf7 Rxg2+ 5. Kh1 Qxf7 6. Qxf7
                9     4.62   4.92   1. Bxh6+ Kh8 2. Rf7 Ne5 3. Bg7+ Kg8
                                    4. Bxe5 Kxf7 5. Rf1+ Bf6 6. Rxf6+ Kg8
                                    7. Qxg6+ Kh8
                9->   4.76   4.92   1. Bxh6+ Kh8 2. Rf7 Ne5 3. Bg7+ Kg8
                                    4. Bxe5 Kxf7 5. Rf1+ Bf6 6. Rxf6+ Kg8
                                    7. Qxg6+ Kh8
               10     6.73     --   1. Bxh6+
               10    10.39     ++   1. Bxh6+!!
               10    23.99   5.59   1. Bxh6+ Kh8 2. Qxg6 Rg8 3. Qh5 Bd8
                                    4. d5 exd5 5. Rf7 Qxf7 6. Qxf7 Na5
               10->  24.29   5.59   1. Bxh6+ Kh8 2. Qxg6 Rg8 3. Qh5 Bd8
                                    4. d5 exd5 5. Rf7 Qxf7 6. Qxf7 Na5
               11    28.50     --   1. Bxh6+
               11    45.24   4.23   1. Bxh6+ Kh8 2. Rf7 Ne5 3. Bg7+ Kg8
                                    4. Bxe5 Kxf7 5. Rf1+ Bf6 6. Qg5 Rg8
                                    7. Rxf6+ Ke8 8. Qe3
               11->  46.35   4.23   1. Bxh6+ Kh8 2. Rf7 Ne5 3. Bg7+ Kg8
                                    4. Bxe5 Kxf7 5. Rf1+ Bf6 6. Qg5 Rg8
                                    7. Rxf6+ Ke8 8. Qe3
               12    49.21     ++   1. Bxh6+!!
               12->   2:25   4.62   1. Bxh6+ Kh8 2. Rf7 Ne5 3. Bg7+ Kg8
                                    4. Bxe5 Kxf7 5. Rf1+ Bf6 6. Qg5 Rg8
                                    7. Rxf6+ Ke8 8. Qe3
               13     2:33     ++   1. Bxh6+!!
              time=3:00  cpu=99%  mat=0  n=106493706  fh=96%  nps=590k
              ext-> chk=8701815 cap=103433 pp=13973 1rep=797772 mate=31259
              predicted=0  nodes=106493706  evals=9733723
              endgame tablebase-> probes done=0  successful=0

In short, I think GM Gulko made one single mistake and a very forgiveable one at
that.  Namely, here:
4r3/pb1qbk2/1pn1pnpp/8/3P1BB1/2P5/PP2Q1PP/R4RK1 b - - am Nxg4; bm h5; id
"Shredder/Gulko 3-20-02";





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