Author: Dann Corbit
Date: 13:39:42 01/15/03
Go up one level in this thread
On January 15, 2003 at 00:08:12, Dann Corbit wrote:
>On January 14, 2003 at 22:05:34, scott farrell wrote:
>
>>Do we know that if you play Rb4, that white has to take the sac?
>>
>>If white doesnt have to take the Rook sac, then maybe there is no solution to
>>wac.230.
>>
>>BTW: a few more minutes of thinking, and lots more fail lows, and the score has
>>dropped below 1.0. It likes Rb5 and Rh7 equally. I think both moves are equally
>>dumb.
>>
>>ply 10=2.53
>>ply 11=2.35
>>ply 12=0.88
>>ply 13 partial=0.64 (still thinking at this ply)
>>
>>The branching factor goes out the wazzooo as it starts detecting blockades, the
>>branching factor is around 11 now at ply 12, as a good move previously now shows
>>a draw, everything shows a draw, basically it is breaking down
>>null-move,alha-beta, everything, down to a straight brute force look at every
>>move.
>>
>>Thinking more on your ideas on what to do on detecting lots of blockades. I
>>might experiment with turing things off like : nullmove, pruning, reductions, or
>>say moving null move to R=1 (I use R=2 normally).
>
>It is not known if it is accurate. It is known that the key move is the only
>move with winning chances and at worst it draws.
>
>Here is the game it actually occurred in:
>
>[Event "?"]
>[Site "Bad Niendorf"]
>[Date "1927.??.??"]
>[Round "6"]
>[White "Kmoch, Hans"]
>[Black "Nimzowitsch, Aron I"]
>[Result "0-1"]
>[ECO "C15p"]
>
>1.e4 Nc6 2.Nc3 e6 3.d4 Bb4 4.Ne2 d5 5.e5 h5 6.Nf4 g6 7.Be3 Bxc3+ 8.bxc3 Na5 9.
>Bd3 Ne7 10.Nh3 c5 11.Bg5 c4 12.Be2 Nac6 13.Bf6 Rg8 14.O-O Qa5 15.Qd2 Nf5 16.
>Rfd1 Kd7 17.Ng5 Rf8 18.h3 Kc7 19.g4 hxg4 20.hxg4 Nfe7 21.Kg2 Ng8 22.Bg7 Re8 23.
>Rh1 Bd7 24.Rh3 Nd8 25.Rf3 Rc8 26.Rh1 Qxa2 27.Rh7 Kb8 28.Nxf7 Nxf7 29.Rxf7 Bc6
>30.Bf6 a5 31.Rh1 Qb2 32.Bg5 Rf8 33.Rfh7 Rc7 34.Rxc7 Kxc7 35.Qc1 Qxc3 36.Qa1
>Qxa1 37.Rxa1 Ra8 38.Bd2 b6 39.Kg3 Ne7 40.Bd1 Bd7 41.Bb4 Nc6 42.Bd6+ Kb7 43.c3
>b5 44.Rb1 b4 45.Ba4 b3 46.Bxc6+ Kxc6 47.g5 Ra7 48.Rb2 Rb7 49.Kf4 Bc8 50.Kg3
>{
>[D]2b5/1r6/2kBp1p1/p2pP1P1/2pP4/1pP3K1/1R3P2/8 b - -
>}
>.. Rb4
>51.cxb4 a4 52.b5+ Kxb5 53.Ba3 c3 54.Rb1 Kc4 55.f4 Kxd4 56.Kf2 Kc4 57.Ke1 d4 58.
>Ke2 Kd5 59.Kf3 Bb7 60.Re1 Kc4+ 61.Kf2 b2 62.f5 exf5 63.e6 Bc6 0-1
>
>Here is Ruffian's analysis:
>E:\programme\winboard\ruffian>ruffian -h 300M -T WAC230.EPD -t 999 -p 9
>Hash size 314572800
>Ruffian 1.0.1
>feature done=0
>Loading configuration: ruffian.cfg
>Warning: EGTB_HASH_SIZE changed, default=1048576, newvalue=8388608
>Logfile: Tue Jan 14 20:15:53 2003
>Total hash size 300M
>Initializing tablebases: /programme/winboard/nalimov
>Testing WAC230.EPD, 999 seconds, extra ply 9
>Testing: WAC.230 Solution: Rb4
> 2b5/1r6/2kBp1p1/p2pP1P1/2pP4/1pP3K1/1R3P2/8 b - -
> Depth Time Score Best line
> 12/18 1.03 1.98 ... a4 Ba3 Rh7 f3 Rh5 Kf4 Rh1 Bd6 Rc1 Bb4 Bb7 Ke3
> Re1+
> 12/18 1.26 x.xx ... Rh7
> 12--> 1.72 1.98 ... a4 Ba3 Rh7 f3 Rh5 Kf4 Rh1 Bd6 Rc1 Bb4 Bb7 Ke3
> Re1+
> 13/23 2.26 2.00 ... a4 Ba3 Rh7 Rb1 Rh8 f4 Ba6 Kg4 Kd7 Rb2 Bb5 Kg3
> Bc6
> 13--> 2.64 2.00 ... a4 Ba3 Rh7 Rb1 Rh8 f4 Ba6 Kg4 Kd7 Rb2 Bb5 Kg3
> Bc6
> 14/23 2.95 1.96 ... a4 Ba3 Rh7 Rb1 Rh8 f4 Ba6 Kg4 Rh5 Rb2 Rh7 Bd6
> Bb5 Ba3
> 14--> 3.54 1.96 ... a4 Ba3 Rh7 Rb1 Rh8 f4 Ba6 Kg4 Rh5 Rb2 Rh7 Bd6
> Bb5 Ba3
> 15/25 4.63 2.00 ... a4 Ba3 Rh7 Rb1 Rh8 f4 Ba6 Bb2 Bb5 Ba3 Rh7 Rb2
> Rh1 Kf2 Kd7 Ke3
> 15--> 4.96 2.00 ... a4 Ba3 Rh7 Rb1 Rh8 f4 Ba6 Bb2 Bb5 Ba3 Rh7 Rb2
> Rh1 Kf2 Kd7 Ke3
> 16/29 6.62 1.99 ... a4 Ba3 Rh7 Rb1 Rh8 f4 Ba6 Bb2 Rh5 Kg2 Rh7 Ra1
> Bb5 Kg3
> 16--> 9.19 1.99 ... a4 Ba3 Rh7 Rb1 Rh8 f4 Ba6 Bb2 Rh5 Kg2 Rh7 Ra1
> Bb5 Kg3
> 17/29 12.62 2.00 ... a4 Ba3 Rh7 Rb1 Rh8 f3 Ba6 Bb2 Rh5 f4 Kd7 Ba3
> Bb5 Rb2 Rh1 Kg4 Bc6
> 17/32 28.18 x.xx ... Rb4
> 17--> 31.40 2.00 ... a4 Ba3 Rh7 Rb1 Rh8 f3 Ba6 Bb2 Rh5 f4 Kd7 Ba3
> Bb5 Rb2 Rh1 Kg4 Bc6
> 18/33 36.09 2.01 ... a4 Ba3 Rh7 Rb1 Rh8 f3 Ba6 Bb2 Rh5 f4 Rh7 Ra1
> Bb5 Rb1 Kd7 Ra1 Rh8
> 18--> 38.24 2.01 ... a4 Ba3 Rh7 Rb1 Rh8 f3 Ba6 Bb2 Rh5 f4 Rh7 Ra1
> Bb5 Rb1 Kd7 Ra1 Rh8
> 19/34 55.87 2.02 ... a4 Ba3 Rh7 Rb1 Rh8 Bb2 Ba6 Kg4 Kd7 Ba3 Rh5 Bb2
> Bb5 Ba3 Rh2 Kg3 Rh8 Rb2 Bc6 f3 Bb5 Kf4 Rh1 Ke3
> 19--> 1:00 2.02 ... a4 Ba3 Rh7 Rb1 Rh8 Bb2 Ba6 Kg4 Kd7 Ba3 Rh5 Bb2
> Bb5 Ba3 Rh2 Kg3 Rh8 Rb2 Bc6 f3 Bb5 Kf4 Rh1 Ke3
> 20/39 1:22 2.02 ... a4 Ba3 Rh7 Rb1 Rh8 Bb2 Ba6 Kg4 Kd7 Ba3 Bb5 f3
> Rh2 Rb2 Rh1 Bb4 Rc1 Kf4 Bc6 Ke3 Rg1
> 20/40 2:43 x.xx ... Rb4
> 20/40 3:59 ++ ... Rb4
> 20/40 5:40 2.42 ... Rb4 cxb4 a4 b5+ Kxb5 Ba3 c3 Re2 Kc4 f3 Kxd4 Kf4
> Kd3 Rh2 Bd7 Bc1 Bb5 Ba3 c2 Rxc2 Kxc2 Ke3
> 20--> 5:40 2.42 ... Rb4 cxb4 a4 b5+ Kxb5 Ba3 c3 Re2 Kc4 f3 Kxd4 Kf4
> Kd3 Rh2 Bd7 Bc1 Bb5 Ba3 c2 Rxc2 Kxc2 Ke3
> 21/41 16:37 2.61 ... Rb4 cxb4 a4 b5+ Kxb5 Ba3 c3 Rb1 Kc4 f4 Kxd4 Kf3
> Kc4 Ke2 d4 Rb2 cxb2 Bxb2 Kd5 Kf3 Ba6 Kg3 d3
> 21... 16:37 2/16 a4
>
>Time: 16:39, cpu 46.46%, nodes 293396721, nps 293678
>Hash: 128M, used 99%, hits 45%
>EGTB: probs 0, hits 0
>
>Best move: Rb4 (2.61) Solved (1/1)
>
>Summery: 1/1
>
>Compare actual:
>cxb4 a4 b5+ Kxb5 Ba3 c3 Rb1 Kc4 f4 Kxd4 Kf2 Kc4 Ke1 d4 Ke2 ...
>To computed:
>cxb4 a4 b5+ Kxb5 Ba3 c3 Rb1 Kc4 f4 Kxd4 Kf3 Kc4 Ke2 d4 Rb2 ...
>
>And they agree pretty far along the trajectory.
>
>There may be an equally brilliant counter move. This is from Alex Szabo:
>
>"#230 [Rb4 does not win. The main line is, 1... Rb4!? 2. cxb4 a4 3. b5+ Kxb5 4.
>Ba3 c3 5. Re2! Kc4 6. f4 Kxd4 7. f5 exf5 8. e6 Kd3 9. e7 Bd7 10. Kf3 d4 11. Rh2
>Kc4 12. Rh8 b2 13. Rb8 d3 14. Bxb2 cxb2 15. Rxb2 a3 16. Rb7 Be8 17. Ra7 Kb3 18.
>Ke3 a2 19. Kxd3 Kb2 20. Rb7+ Kc1 21. Ra7 =] Ra7, Rb6, Rb5, Rd7, Rf7, Rg7, Rh7,
>Bd7, Kd7, Kb6, Kb5, a4, and Rc7 are just as good as the book solution Rb4 --
>they all hold the game."
>
>The Re2! is not considered by the chess programs and was not played in the game.
> It may be an equally brilliant refutation to the brilliant move.
>
>Here is the continuation by Ruffian after the counter move 5. Re2! (which is
>clearly the best response):
>
>E:\PROGRA~3\winboard\ruffian>ruffian -h 300M -T foo.epd -t 999 -p 99
>Hash size 314572800
>Ruffian 1.0.1
>feature done=0
>Loading configuration: ruffian.cfg
>Warning: EGTB_HASH_SIZE changed, default=1048576, newvalue=8388608
>Logfile: Tue Jan 14 20:50:56 2003
>Total hash size 300M
>Initializing tablebases: /programme/winboard/nalimov
>Testing foo.epd, 999 seconds, extra ply 99
>Testing: test 1 Solution: Kc4
> 2b5/8/4p1p1/1k1pP1P1/p2P4/Bpp3K1/4RP2/8 b - -
> Depth Time Score Best line
> 10/21 1.20 2.12 ... Kc4 Re1 Kxd4 Rc1 Ba6 Kf4 Bd3 Bb4 c2 Ba3 Kc4
> 10--> 1.21 2.12 ... Kc4 Re1 Kxd4 Rc1 Ba6 Kf4 Bd3 Bb4 c2 Ba3 Kc4
> 11/23 3.29 2.23 ... Kc4 Re1 Kxd4 Rc1 Kd3 Rd1+ Ke2 Ra1 d4 Bc1 Bd7
> Bb2
> 11--> 3.30 2.23 ... Kc4 Re1 Kxd4 Rc1 Kd3 Rd1+ Ke2 Ra1 d4 Bc1 Bd7
> Bb2
> 12/25 8.73 2.25 ... Kc4 Kf4 Kxd4 Re1 Kc4 Rb1 d4 Rc1 Kd5 f3 b2 Bxb2
> cxb2 Rb1
> 12--> 8.75 2.25 ... Kc4 Kf4 Kxd4 Re1 Kc4 Rb1 d4 Rc1 Kd5 f3 b2 Bxb2
> cxb2 Rb1
> 13/27 21.76 2.56 ... Kc4 Kf4 Kxd4 Re1 Kc4 f3 d4 Rh1 Bd7 Rc1 d3 Bb2
> c2 Ke3
> 13--> 21.80 2.56 ... Kc4 Kf4 Kxd4 Re1 Kc4 f3 d4 Rh1 Bd7 Rc1 d3 Bb2
> c2 Ke3
> 14/30 32.82 2.48 ... Kc4 Kf4 Kxd4 Re1 Kc4 Rc1 d4 f3 Ba6 Kg4 d3 Bb2
> d2 Rxc3+ Kd5 Rc1 dxc1=Q Bxc1 Kxe5
> 14--> 32.87 2.48 ... Kc4 Kf4 Kxd4 Re1 Kc4 Rc1 d4 f3 Ba6 Kg4 d3 Bb2
> d2 Rxc3+ Kd5 Rc1 dxc1=Q Bxc1 Kxe5
> 15/35 1:27 2.70 ... Kc4 f3 Kxd4 f4 Ba6 Rh2 Ke4 Rh4 b2 f5+ Kxe5 Rb4
> Kxf5 Rxb2 cxb2 Bxb2 Kxg5 Ba3
> 15--> 1:27 2.70 ... Kc4 f3 Kxd4 f4 Ba6 Rh2 Ke4 Rh4 b2 f5+ Kxe5 Rb4
> Kxf5 Rxb2 cxb2 Bxb2 Kxg5 Ba3
> 16/35 3:16 2.58 ... Kc4 f4 Kxd4 f5 Ba6 Rh2 exf5 e6 Bb5 Rh8 b2 Rh4+
> Ke5 Rb4 Kxe6 Rxb2 cxb2 Bxb2 Bd3
> 16--> 3:16 2.58 ... Kc4 f4 Kxd4 f5 Ba6 Rh2 exf5 e6 Bb5 Rh8 b2 Rh4+
> Ke5 Rb4 Kxe6 Rxb2 cxb2 Bxb2 Bd3
> 17/37 4:37 2.35 ... Kc4 f4 Kxd4 f5 Ba6 Rh2 exf5 e6 Bb5 Rh8 b2 Rh4+
> Ke5 Rb4 Be8 Rxb2 cxb2 Bxb2+ Kxe6 Kf4 Bb5
> 17--> 4:52 2.35 ... Kc4 f4 Kxd4 f5 Ba6 Rh2 exf5 e6 Bb5 Rh8 b2 Rh4+
> Ke5 Rb4 Be8 Rxb2 cxb2 Bxb2+ Kxe6 Kf4 Bb5
> 18/38 6:54 2.27 ... Kc4 f4 Kxd4 f5 exf5 e6 Kd3 e7 Bd7 Rh2 Ke3 Rh8
> b2 Rb8 f4+ Kh2 f3 Bxb2 cxb2 Rxb2 Be8 Kg3
> 18--> 7:07 2.27 ... Kc4 f4 Kxd4 f5 exf5 e6 Kd3 e7 Bd7 Rh2 Ke3 Rh8
> b2 Rb8 f4+ Kh2 f3 Bxb2 cxb2 Rxb2 Be8 Kg3
> 19/42 10:50 2.43 ... Kc4 f4 Kxd4 f5 exf5 e6 Kd3 e7 Bd7 Kf3 Be8 Rh2
> Kd4 Rh4+ Ke5 Rb4 d4 Rb8 Bc6+ Ke2 Ke4 e8=B
> 19--> 11:07 2.43 ... Kc4 f4 Kxd4 f5 exf5 e6 Kd3 e7 Bd7 Kf3 Be8 Rh2
> Kd4 Rh4+ Ke5 Rb4 d4 Rb8 Bc6+ Ke2 Ke4 e8=B
> 20... 11:07 1/10 Kc4
>
>Time: 16:39, cpu 96.75%, nodes 613689959, nps 614298
>Hash: 128M, used 100%, hits 35%
>EGTB: probs 3, hits 3
>
>Best move: Kc4 (2.43) Solved (1/1)
>
>Summery: 1/1
>
>It looks like there is still doubt either way to me, but I'm no GM.
>
>In any case, all other moves don't have any chance to win.
Longer analysis after the suggested key move by Alex Szabo:
E:\programme\winboard\ruffian>ruffian -h 300M -t 86400 -T foo.epd -p 9999
Hash size 314572800
Ruffian 1.0.1
feature done=0
Loading configuration: ruffian.cfg
Warning: EGTB_HASH_SIZE changed, default=1048576, newvalue=8388608
Logfile: Tue Jan 14 23:16:44 2003
Total hash size 300M
Initializing tablebases: /programme/winboard/nalimov
Testing foo.epd, 86400 seconds, extra ply 9999
Testing: test 1 Solution: Kc4
2b5/8/4p1p1/1k1pP1P1/p2P4/Bpp3K1/4RP2/8 b - -
Depth Time Score Best line
10/21 1.15 2.12 ... Kc4 Re1 Kxd4 Rc1 Ba6 Kf4 Bd3 Bb4 c2 Ba3 Kc4
10--> 1.16 2.12 ... Kc4 Re1 Kxd4 Rc1 Ba6 Kf4 Bd3 Bb4 c2 Ba3 Kc4
11/23 2.85 2.23 ... Kc4 Re1 Kxd4 Rc1 Kd3 Rd1+ Ke2 Ra1 d4 Bc1 Bd7
Bb2
11--> 2.86 2.23 ... Kc4 Re1 Kxd4 Rc1 Kd3 Rd1+ Ke2 Ra1 d4 Bc1 Bd7
Bb2
12/25 7.86 2.25 ... Kc4 Kf4 Kxd4 Re1 Kc4 Rb1 d4 Rc1 Kd5 f3 b2 Bxb2
cxb2 Rb1
12--> 7.88 2.25 ... Kc4 Kf4 Kxd4 Re1 Kc4 Rb1 d4 Rc1 Kd5 f3 b2 Bxb2
cxb2 Rb1
13/27 20.54 2.56 ... Kc4 Kf4 Kxd4 Re1 Kc4 f3 d4 Rh1 Bd7 Rc1 d3 Bb2
c2 Ke3
13--> 20.57 2.56 ... Kc4 Kf4 Kxd4 Re1 Kc4 f3 d4 Rh1 Bd7 Rc1 d3 Bb2
c2 Ke3
14/30 31.81 2.48 ... Kc4 Kf4 Kxd4 Re1 Kc4 Rc1 d4 f3 Ba6 Kg4 d3 Bb2
d2 Rxc3+ Kd5 Rc1 dxc1=Q Bxc1 Kxe5
14--> 31.84 2.48 ... Kc4 Kf4 Kxd4 Re1 Kc4 Rc1 d4 f3 Ba6 Kg4 d3 Bb2
d2 Rxc3+ Kd5 Rc1 dxc1=Q Bxc1 Kxe5
15/35 1:25 2.70 ... Kc4 f3 Kxd4 f4 Ba6 Rh2 Ke4 Rh4 b2 f5+ Kxe5 Rb4
Kxf5 Rxb2 cxb2 Bxb2 Kxg5 Ba3
15--> 1:25 2.70 ... Kc4 f3 Kxd4 f4 Ba6 Rh2 Ke4 Rh4 b2 f5+ Kxe5 Rb4
Kxf5 Rxb2 cxb2 Bxb2 Kxg5 Ba3
16/35 3:11 2.58 ... Kc4 f4 Kxd4 f5 Ba6 Rh2 exf5 e6 Bb5 Rh8 b2 Rh4+
Ke5 Rb4 Kxe6 Rxb2 cxb2 Bxb2 Bd3
16--> 3:12 2.58 ... Kc4 f4 Kxd4 f5 Ba6 Rh2 exf5 e6 Bb5 Rh8 b2 Rh4+
Ke5 Rb4 Kxe6 Rxb2 cxb2 Bxb2 Bd3
17/37 4:26 2.35 ... Kc4 f4 Kxd4 f5 Ba6 Rh2 exf5 e6 Bb5 Rh8 b2 Rh4+
Ke5 Rb4 Be8 Rxb2 cxb2 Bxb2+ Kxe6 Kf4 Bb5
17--> 4:40 2.35 ... Kc4 f4 Kxd4 f5 Ba6 Rh2 exf5 e6 Bb5 Rh8 b2 Rh4+
Ke5 Rb4 Be8 Rxb2 cxb2 Bxb2+ Kxe6 Kf4 Bb5
18/38 6:35 2.27 ... Kc4 f4 Kxd4 f5 exf5 e6 Kd3 e7 Bd7 Rh2 Ke3 Rh8
b2 Rb8 f4+ Kh2 f3 Bxb2 cxb2 Rxb2 Be8 Kg3
18--> 6:49 2.27 ... Kc4 f4 Kxd4 f5 exf5 e6 Kd3 e7 Bd7 Rh2 Ke3 Rh8
b2 Rb8 f4+ Kh2 f3 Bxb2 cxb2 Rxb2 Be8 Kg3
19/42 12:18 2.43 ... Kc4 f4 Kxd4 f5 exf5 e6 Kd3 e7 Bd7 Kf3 Be8 Rh2
Kd4 Rh4+ Ke5 Rb4 d4 Rb8 Bc6+ Ke2 Ke4 e8=B
19--> 12:53 2.43 ... Kc4 f4 Kxd4 f5 exf5 e6 Kd3 e7 Bd7 Kf3 Be8 Rh2
Kd4 Rh4+ Ke5 Rb4 d4 Rb8 Bc6+ Ke2 Ke4 e8=B
20/45 22:36 2.29 ... Kc4 f4 Kxd4 f5 exf5 e6 Kd3 e7 Bd7 Kf3 Be8 Rh2
Kd4 Rh4+ Ke5 Rb4 Ke6 Rb8 Kf7 Kf4 c2 Rd8 d4 Rxd4
20--> 23:37 2.29 ... Kc4 f4 Kxd4 f5 exf5 e6 Kd3 e7 Bd7 Kf3 Be8 Rh2
Kd4 Rh4+ Ke5 Rb4 Ke6 Rb8 Kf7 Kf4 c2 Rd8 d4 Rxd4
21/46 59:07 2.26 ... Kc4 f4 Bd7 f5 gxf5 g6 Be8 g7 Bf7 Rh2 Kxd4 Kf4
Kd3 Rh3+ Kc2 Bb4 d4 Rh2+ Kb1 Rh1+ Kb2 Bc5 Bg8 Rh2+
c2 Bxd4+ Kb1 Rh1+ c1=Q+ Rxc1+ Kxc1
21--> 60:28 2.26 ... Kc4 f4 Bd7 f5 gxf5 g6 Be8 g7 Bf7 Rh2 Kxd4 Kf4
Kd3 Rh3+ Kc2 Bb4 d4 Rh2+ Kb1 Rh1+ Kb2 Bc5 Bg8 Rh2+
c2 Bxd4+ Kb1 Rh1+ c1=Q+ Rxc1+ Kxc1
22/49 91:19 -- ... Kc4
22/50 134:39 1.40 ... Kc4 f4 Kxd4 f5 exf5 e6 Kd3 e7 Bd7 Kf3 d4 Rh2
c2 Rh8 Kd2 Rd8 Bc6+ Kf2 d3 Rc8 Bb5 Rb8 c1=Q Bxc1+
Kxc1 Rxb5
22--> 149:58 1.40 ... Kc4 f4 Kxd4 f5 exf5 e6 Kd3 e7 Bd7 Kf3 d4 Rh2
c2 Rh8 Kd2 Rd8 Bc6+ Kf2 d3 Rc8 Bb5 Rb8 c1=Q Bxc1+
Kxc1 Rxb5
23/50 217:54 ++ ... Kc4
23/52 306:19 1.87 ... Kc4 f4 Kxd4 f5 exf5 e6 Kd3 e7 Bd7 Kf3 d4 Rh2
c2 Rh8 Kd2 Kf4 d3 Ke5 Ke2 Rh2+ Ke1 Kd4 d2 Rh1+ Kf2
23--> 319:16 1.87 ... Kc4 f4 Kxd4 f5 exf5 e6 Kd3 e7 Bd7 Kf3 d4 Rh2
c2 Rh8 Kd2 Kf4 d3 Ke5 Ke2 Rh2+ Ke1 Kd4 d2 Rh1+ Kf2
24/53 391:35 -- ... Kc4
24/54 659:52 1.23 ... Kc4 f4 Kxd4 f5 exf5 e6 Kd3 e7 Bd7 Kf3 d4 Rh2
Kc4 Rh8 b2 Rb8 d3 Rb4+ Kd5 Bxb2 cxb2 Rxb2 Ke6 Ke3
Kxe7 Kxd3 f4 Kd4
24... 859:20 8/10 Ka5
Dropping like a stone.
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