Author: Uri Blass
Date: 13:20:25 10/14/01
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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 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 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 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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