Author: Uri Blass
Date: 13:22:03 10/14/01
Go up one level in this thread
On October 14, 2001 at 16:20:25, Uri Blass wrote: >On October 14, 2001 at 14:38:56, Dieter Buerssner wrote: > >>On October 14, 2001 at 14:13:22, Uri Blass wrote: >> >>>On October 14, 2001 at 13:59:43, Dieter Buerssner wrote: >>> >>>>Only allow underpromotion to R or B, when promotion to Q is an immediate >>>>stalemate. >> >>>It may be a good idea for games but in studies there are cases when promotion to >>>queen lead to stalemate but not an immediate stalemate. >> >>I have no doubt, that this is true. But I am curious as well ... >>Do you have any such positions handy? > >Yes > >Here is a study of G.Costeff when yace can find 5.h8B and 6.c8R in few seconds. >Note that it seems that the study is wrong because the underpromotion do not >lead to a win after 6...Qf1 7.Rb8 Qh1(see the analysis of yace at the bottom) > >New position [D]6R1/p1P4P/3p4/P2kNp2/1P3P2/KP6/1P1pp3/7r w - - 0 1 > >Analysis by Yace 0.99.56: > >1.h8Q Rxh8 2.c8Q d1Q > +- (3.04) Depth: 1 00:00:03 >1.c8Q d1Q > +- (4.43) Depth: 1 00:00:03 >1.c8Q Ra1# > -+ (-#1) Depth: 2 00:00:03 >1.b5 Ra1+ 2.Kb4 e1Q > -+ (-#2) Depth: 2 00:00:03 >1.b5 d1Q 2.h8Q Rxh8 3.c8Q e1Q 4.Rxh8 dxe5 > -+ (-3.58) Depth: 2 00:00:03 >1.Ka4 Ra1+ 2.Kb5 d1Q > -+ (-3.48) Depth: 2 00:00:03 >1.Ka4 e1Q 2.c8Q d1Q 3.h8Q Rxh8 4.Rxh8 dxe5 5.fxe5 Qxe5 6.Qxf5 > -+ (-2.37) Depth: 2 00:00:04 >1.Rg1 e1Q 2.Rxe1 dxe1Q 3.c8Q > -+ (-2.04) Depth: 2 00:00:04 >1.Rg1 Rxg1 2.h8Q d1Q 3.c8Q e1Q > ³ (-0.59) Depth: 2 00:00:04 >1.Rg1 Rxg1 2.h8Q d1Q 3.c8Q e1Q > ³ (-0.59) Depth: 3 00:00:04 >1.Rg1 Rxg1 2.Ng6 d1Q 3.h8Q > µ (-0.99) Depth: 4 00:00:04 >1.Rg1 Rxg1 2.c8R e1Q 3.Rc5+ dxc5 4.h8Q > -+ (-2.03) Depth: 4 00:00:04 >1.Rg1 Rxg1 2.Ka2 Ra1+ 3.Kxa1 d1Q+ 4.Ka2 e1Q > -+ (-3.75) Depth: 4 00:00:04 >1.Ka4 Rxh7 2.c8Q d1Q > -+ (-3.74) Depth: 4 00:00:04 >1.Ka4 d1Q 2.h8Q Qa1+ 3.Kb5 Rxh8 4.c8Q e1Q 5.Rxh8 dxe5 6.Qxf5 Qxb2 > -+ (-3.12) Depth: 4 00:00:04 >1.Ka4 d1Q 2.h8Q Qa1+ 3.Kb5 Rxh8 4.c8Q e1Q 5.Rxh8 dxe5 6.Qxf5 Qxb2 > -+ (-3.12) Depth: 5 00:00:04 15kN >1.Ka4 d1Q 2.c8Q dxe5 3.Qc4+ Kd6 > -+ (-2.72) Depth: 6 00:00:04 30kN >1.Ka4 e1Q 2.c8Q Qa1+ 3.Kb5 a6+ 4.Kxa6 d1Q 5.h8Q > µ (-1.23) Depth: 6 00:00:04 30kN >1.Ka4 e1Q 2.c8Q Qa1+ 3.Kb5 a6+ 4.Kxa6 dxe5 5.Qc4+ Kd6 > µ (-0.83) Depth: 7 00:00:04 82kN >1.Ka4 a6 2.Nc4 e1Q 3.c8Q Qa1+ 4.Na3 d1Q > = (0.21) Depth: 7 00:00:04 126kN >1.Ka4 a6 2.Nc4 e1Q 3.c8Q Kd4 4.h8Q+ Rxh8 > ² (0.61) Depth: 8 00:00:04 336kN >1.Ka4 a6 2.Nc4 Ra1+ 3.Na3 Rc1 4.h8Q d1Q 5.Re8 > +- (3.19) Depth: 8 00:00:05 484kN >1.Ka4 a6 2.Nc4 Ra1+ 3.Na3 Rc1 4.h8Q d1Q 5.Re8 Rxc7 6.Qh4 > +- (3.19) Depth: 9 00:00:07 1221kN >1.Ka4 a6 2.Nc4 Ra1+ 3.Na3 Rxa3+ 4.bxa3 d1N 5.h8Q e1Q 6.Qh1+ Qxh1 7.b5 Nb2+ 8.Kb4 >Kd4 9.c8N > +- (2.79) Depth: 10 00:00:08 1491kN >1.Ka4 a6 2.Nc4 Ra1+ 3.Na3 Rxa3+ 4.bxa3 d1N 5.h8B e1Q 6.c8R Qe4 7.Ra8 Qd3 8.Rab8 >Ne3 > +- (1.80) Depth: 10 00:00:12 2621kN >1.Ka4 a6 2.Nc4 Ra1+ 3.Na3 Rxa3+ 4.bxa3 d1N 5.h8B e1Q 6.c8R Qe2 7.Rb8 Qe3 8.Rg6 >Qc3 9.Rg2 Qe3 10.Rb6 > +- (1.88) Depth: 11 00:00:34 10358kN >1.Ka4 a6 2.Nc4 Ra1+ 3.Na3 Rxa3+ 4.bxa3 d1N 5.h8B e1Q 6.c8R Qe7 7.Rb8 Qh4 8.Rg1 >Nf2 9.Ra8 Ne4 > +- (1.81) Depth: 12 00:01:20 26195kN >1.Ka4 a6 2.Nc4 Ra1+ 3.Na3 Rxa3+ 4.bxa3 d1N 5.h8B e1Q 6.c8R Qe2 7.Rb8 Qh2 8.Bg7 >Qxf4 9.Rb6 Qg3 10.Rd8 Ne3 > +- (1.54) Depth: 13 00:03:55 79368kN > >(Blass, Tel-aviv 14.10.2001) > >New position [D]2R3RB/8/p2p4/P2k1p2/KP3P2/PP6/8/3nq3 b - - 0 1 > >Analysis by Yace 0.99.56: > >6...Qe2 7.Rb8 Qh2 8.Bf6 Qxf4 9.Rbc8 Ne3 10.Rge8 Qf1 11.Rb8 Ng4 12.Bg7 > ± (1.37) Depth: 10 00:00:00 49kN >6...Qe2 7.Rb8 Qh2 8.Bf6 Qxf4 9.Rgd8 Qh4 10.Ba1 f4 11.Rbc8 f3 12.Bg7 > ± (1.40) Depth: 11 00:00:14 5842kN >6...Qf1 7.Rb8 Qh1 8.Ba1 Nf2 9.Bg7 Nd3 10.Rbc8 Qe4 11.Bh8 > ± (1.39) Depth: 11 00:00:30 12058kN >6...Qf1 7.Rb8 Qh1 8.Ba1 Nf2 9.Bg7 Nd3 10.Rge8 Qh7 11.Re3 Nxf4 12.Re7 > ± (1.38) Depth: 11 00:00:31 12464kN >6...Qf1 7.Rb8 Qh1 8.Ba1 Ne3 9.Bb2 Nd1 10.Bg7 Qg1 11.Rb6 Qxg7 12.b5 Nb2+ 13.Kb4 > ± (0.98) Depth: 12 00:00:41 16331kN >6...Qf1 7.Rb8 Qh1 8.Ba1 Ne3 9.Bf6 Nc2 10.Rgc8 Qc1 11.Rxc2 Qxc2 12.Rb6 Qe2 13.Bg7 >Ke4 14.Bf6 > = (0.22) Depth: 12 00:00:46 18058kN >6...Qf1 7.Rb8 Qh1 8.Ba1 Ne3 9.Bg7 Nc2 10.Rgc8 Qc1 11.Rxc2 Qxc2 > = (0.22) Depth: 13 00:01:08 26815kN >6...Qf1 7.Rb8 Qh1 8.Ba1 Ne3 9.Bg7 Nc2 10.Rgc8 Qc1 11.Rxc2 Qxc2 12.Rb6 Qe4 13.Bc3 >Qe3 14.Ba1 Qd3 > = (0.10) Depth: 14 00:02:26 57812kN > >(Blass, Tel-aviv 14.10.2001) >New position [D]1R4RB/8/p2p4/P2k1p2/KP3P2/PP6/8/3n3q w - - 0 1 > >Analysis by Yace 0.99.56: > >8.Bg7 > +- (2.15) Depth: 1 00:00:03 >8.Rbc8 > +- (2.41) Depth: 1 00:00:03 >8.Rbe8 > +- (2.42) Depth: 1 00:00:03 >8.Rbe8 Kc6 > +- (2.26) Depth: 2 00:00:03 >8.Rbe8 Qf1 9.Ra8 > +- (1.97) Depth: 3 00:00:03 >8.Rbc8 Ke6 > +- (2.19) Depth: 3 00:00:03 >8.Rbc8 Ke4 9.Rc4+ Ke3 > +- (2.26) Depth: 3 00:00:03 >8.Rbd8 Qg1 > +- (2.28) Depth: 3 00:00:03 >8.Rbd8 Qe4 9.Be5 > +- (2.33) Depth: 3 00:00:03 >8.Rbd8 Qf1 9.Rxd6+ Kxd6 10.Rd8+ Ke6 11.Rxd1 > +- (1.55) Depth: 4 00:00:03 >8.Rbd8 Qf1 9.Rb8 Qh1 > = (0.00) Depth: 4 00:00:03 >8.Rbd8 Qf1 9.Rb8 Qh1 10.Rbd8 Qf1 11.Rb8 > = (0.00) Depth: 4 00:00:03 >8.Rbc8 Qf1 9.Rc4 Nb2+ 10.Bxb2 Qxc4 > ² (0.28) Depth: 4 00:00:03 >8.Rbc8 Qf3 9.Rc4 Ke6 > +- (2.11) Depth: 4 00:00:03 >8.Rge8 Qh7 > +- (2.12) Depth: 4 00:00:03 >8.Rge8 Qxh8 9.Re1 > +- (2.11) Depth: 4 00:00:03 >8.Rbc8 Qf3 9.Rc4 Ke6 > +- (2.11) Depth: 4 00:00:03 >8.Rbc8 Qxh8 9.b5 Nb2+ 10.Kb4 Qh3 11.bxa6 > ± (0.85) Depth: 5 00:00:04 12kN >8.Rbc8 Qxh8 9.Rge8 > ³ (-0.30) Depth: 5 00:00:04 12kN >8.Rbc8 Qxh8 9.Rc2 Qxg8 10.Rd2+ Ke4 11.Rxd1 > -+ (-3.32) Depth: 5 00:00:04 12kN >8.Rge8 Qxh8 > -+ (-2.74) Depth: 5 00:00:04 12kN >8.Rge8 Qxh8 9.Rb6 Qxe8+ 10.b5 > -+ (-3.32) Depth: 5 00:00:04 12kN >8.Rbc8 Qxh8 9.Rc2 Qxg8 10.Rd2+ Ke4 11.Rxd1 > -+ (-3.32) Depth: 5 00:00:04 12kN >8.Bg7 Qf1 9.Bd4 Kxd4 > -+ (-3.31) Depth: 5 00:00:04 12kN >8.Bg7 Ne3 9.Rge8 Qf3 10.Rb6 > +- (2.31) Depth: 5 00:00:04 12kN >8.Bg7 Qe4 9.Bd4 Qxd4 10.Ra8 > +- (1.91) Depth: 6 00:00:04 33kN >8.Bg7 Qh6 9.Rbc8 Qxf4 10.Rge8 Ne3 > +- (1.60) Depth: 6 00:00:04 33kN >8.Ba1 Ke4 9.b5 axb5+ 10.Rxb5 Ne3 11.Re8+ Kd3 > +- (1.61) Depth: 6 00:00:04 33kN >8.Ba1 Ne3 9.Bg7 Qe4 10.Rb6 Qd3 > +- (1.99) Depth: 6 00:00:04 33kN >8.Ba1 Qh2 9.Rb6 Qb2 10.Rxd6+ Kxd6 11.b5 Nc3+ 12.Kb4 > +- (1.59) Depth: 7 00:00:04 175kN >8.Ba1 Qh2 9.Bg7 Qxf4 10.Rbc8 Qg4 11.Rc4 > +- (1.56) Depth: 7 00:00:04 184kN >8.Ba1 Qh2 9.Bg7 Qh6 10.Rbf8 Qxf4 11.Rc8 Qg4 12.Be5 Qe4 > +- (1.43) Depth: 8 00:00:04 331kN >8.Ba1 Ne3 9.Rge8 Nc2 10.Bb2 Qb1 11.Bf6 Qa2 12.Bb2 Qxb2 13.Rbc8 > ± (1.05) Depth: 9 00:00:05 593kN >8.Ba1 Ne3 9.Rge8 Nc2 10.Bb2 Qb1 11.b5 Qxb2 12.Rb6 > ² (0.65) Depth: 10 00:00:07 1677kN >8.Ba1 Ne3 9.Bf6 Nc2 10.Rgc8 Qc1 11.Rxc2 Qxc2 12.Rb6 > ² (0.32) Depth: 10 00:00:09 2242kN >8.Ba1 Ne3 9.Bf6 Nc2 10.Rgc8 Qc1 11.Rxc2 Qxc2 12.Rb6 Qe2 13.Bc3 Ke4 14.Rxd6 Kxf4 > = (0.15) Depth: 11 00:00:13 3969kN >8.Ba1 Ne3 9.Bf6 Nc2 10.Rgc8 Qc1 11.Rxc2 Qxc2 12.Rb6 Qe2 13.Bc3 Ke4 14.b5 axb5+ >15.Rxb5 Kxf4 > = (0.10) Depth: 12 00:00:32 11305kN >8.Ba1 Ne3 9.Bg7 Nc2 10.Rgc8 Qc1 11.Rxc2 Qxc2 12.Bf8 Qe2 13.Bh6 Kc6 14.Rb6+ Kd5 >15.Rb8 Kc6 16.Rb6+ Kd5 17.Rb8 > = (0.00) Depth: 13 00:01:07 25137kN > >(Blass, Tel-aviv 14.10.2001) > >Uri
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