Author: Robert Allgeuer
Date: 14:14:51 10/19/04
Following comments from people in the Winboard forum I have updated the recently posted Zugzwang test suite; see the 30 positions at the end of this post. In order to see, whether results of this testsuite can say something about the capability of an engine to deal with Zugzwang, I have compared 3 settings of a beta version of Fruit: one with the verification search only in endgames (vseg, which is default), one with the verification search always (vsalw) and one with the verification search totally disabled (vsnvr). The results differ quite significantly, as can be seen below. Time per position: 3 min Athlon XP 2400+ Rated time is the sum of solution times in seconds; 180 in case the position was not solved. Position Fruit X vseg Fruit X vsalw Fruit X vsnvr ZPTS 1 0 0 0 ZPTS 2 0 0 0 ZPTS 3 0 0 0 ZPTS 4 0 0 0 ZPTS 5 0 0 0 ZPTS 6 180 0 180 ZPTS 7 3 0 0 ZPTS 8 0 0 0 ZPTS 9 23 20 38 ZPTS 10 0 0 0 ZPTS 11 180 0 180 ZPTS 12 180 0 68 ZPTS 13 0 0 0 ZPTS 14 180 180 180 ZPTS 15 180 0 180 ZPTS 16 26 180 180 ZPTS 17 180 7 180 ZPTS 18 0 0 180 ZPTS 19 180 180 180 ZPTS 20 180 180 180 ZPTS 21 180 80 180 ZPTS 22 0 0 0 ZPTS 23 180 0 180 ZPTS 24 18 53 180 ZPTS 25 180 11 180 ZPTS 26 61 1 62 ZPTS 27 180 2 180 ZPTS 28 180 180 180 ZPTS 29 0 0 0 ZPTS 30 13 10 13 Rated Time 2484 1084 2881 Total Solved 17 25 15 3k4/8/4K3/2R5/8/8/8/8 w - - bm Rc1 Rc2 Rc3 Rc4 Rc6; c0 "CCC post"; id "ZPTS.01"; 1k6/7R/2K5/8/8/8/8/8 w - - bm Re7 Rf7 Rg7 Rh1 Rh2 Rh3 Rh4 Rh5 Rh6 Rh8+; c0 "CCC post"; id "ZPTS.02"; 8/3k4/8/8/3PK3/8/8/8 w - - bm Kd5; c0 "CCC post"; id "ZPTS.03"; 2k5/8/1K1P4/8/8/8/8/8 w - - bm Kc6; c0 "white wins"; id "ZPTS.04"; 8/8/8/4N3/8/7p/8/5K1k w - - bm Ng4; c0 "white mates"; id "ZPTS.05"; 8/8/1p1K4/Pp6/2k1p3/8/1P6/8 w - - bm a6; c0 "Kubbel 1927, 1 ... e3 2 a7 e2 3 a8/Q e1/Q 4 Qd5+ Kb4 5 Qd3!, white wins"; id "ZPTS.06"; 8/1p5k/1P1p4/3p4/3Pp2p/2K1P2p/7P/8 w - - bm Kb2; c0 "1 Kb2! Kg8 2 Ka1!!, draw"; id "ZPTS.07"; 8/4N3/8/8/8/2b1p3/p1K1P3/k7 w - - bm Nc6; c0 "white mates in 3"; id "ZPTS.08"; 8/8/7p/2R5/4pp1K/8/8/3k2b1 w - - bm Rc4; c0 "Kricheli 1986, 1 Rc4! e3 2 Rd4+! Kc2 3 Rxf4 e2 4 Re4 Kd2 5 Rxe2+ Kxe2 6 Kg4!, draw"; id "ZPTS.09"; 4KBkr/7p/6PP/4P3/8/3P1p2/8/8 w - - bm g7; c0 "CCC post 27.4.2004 by Gerd Isenberg, white wins"; id "ZPTS.10"; 8/p7/1p6/p7/kq1Q4/8/K7/8 w - - bm Qd3; c0 "post in Avler chess forum, mate in 13: 1.Qd3 a6 2.Qd7+ Qb5 3.Qd4+ Qb4 4.Qd3 Qb2+ 5.Kxb2 Kb4 6.Qc3+ Kb5 7.Qc7 Kb4 8.Qc6 a4 9.Kc2 a3 10.Qc3+ Ka4 11.Qc4+ Ka5 12.Kb3 b5 13.Qc7#"; id "ZPTS.11"; 8/8/p3R3/1p5p/1P5p/6rp/5K1p/7k w - - bm Re1+; c0 "CCC post by Eduard Nemeth, mate in 7"; id "ZPTS.12"; 8/5b2/p2k4/1p1p1p1p/1P1K1P1P/2P1PB2/8/8 w - - bm Bd1 Be2; c0 "CCC post by Sune Fischer, Averbakh 1954, white wins: 1.Be2 Be8 [1.-Bg6 2.Bd3 Bh7 3.Bf1 leads to instant zugzwang, be it after 3.-Bg6 4.Bg2 Bf7 5.Bf3 or after 3.-Bg8 4.Be2 Bf7 5.Bf3] 2.Bd3 Bg6 3.Bc2 Bh7 4.Bb3! Bg8 5.Bd1 Bf7 6.Bf3! and so on"; id "ZPTS.13"; 6k1/3p4/P2P4/8/5Kp1/1p4Q1/p5p1/b7 w - - bm Qxg2; c0 "Kasparyan 1959, 1 ... Be5+ 2 Kf5! a1/Q 3 a7! Qxa7 4 Kg6! Qa1! 5 Qd5! Kh8 6 Qe4!!, white wins"; id "ZPTS.14"; 1r4RK/2n5/7k/8/8/8/8/8 b - - bm Ne8; c0 "Polgar - Kasparov, 1996: mate in 8: 1. ... Ne8 2.Rf8 Kg6 3.Rg8+ Kf7 4.Kh7 Rb5 5.Rf8+ Kxf8 6.Kg6 Rc5 7.Kh6 Kf7 8.Kh7 Rh5#"; id "ZPTS.15"; k2N2K1/8/8/8/5R2/3n4/3p4/8 w - - bm Rf7; c0 "CCC post by Ed Schroeder, Troitzky"; id "ZPTS.16"; 8/8/1p1r1k2/p1pPN1p1/P3KnP1/1P6/8/3R4 b - - bm Nxd5; c0 "CCC post 27.4.2004 by Gerd Isenberg"; id "ZPTS.17"; 8/6B1/p5p1/Pp4kp/1P5r/5P1Q/4q1PK/8 w - - bm Qxh4+; c0 "CCC post 10.9.2004 by Alvaro Begue"; id "ZPTS.18"; n1QBq1k1/5p1p/5KP1/p7/8/8/8/8 w - - bm Bc7; c0 "CCC post, mate in 12: 1.Bc7 Qxc8 2.gxf7+ Kh8 3.Be5 Qc5 4.Bb2 Nc7 5.Ba1 a4 6.Bb2 a3 7.Ba1 a2 8.Bb2 a1Q 9.Bxa1 Nd5+ 10.Ke6+ Nc3 11.Bxc3+ Qe5+ 12.Bxe5#"; id "ZPTS.19"; 3nQ1k1/p2P2p1/1p6/8/5q1P/8/PP6/1K6 b - - bm Kh7; c0 "CCC post, draw, but h5 after Qf8 wins for white"; id "ZPTS.20"; 8/8/8/1B6/6p1/8/4KPpp/3N2kr w - - bm Kd3 Ke3; c0 "CCC post by Tim Foden, id MES.831, white wins, 1. Kd3 g3 2. f4 Kf1 3. Kd2+ Kg1 4. Bd7 Kf1 5. Bh3 Rg1 6. Bg4 Rh1 7. Be2+ Kg1 8. Nc3 Kf2 9. Ne4+ Kg1 10. Ng5 Kf2 11. Nh3#"; id "ZPTS.21"; 4B3/8/p7/k2N4/7p/K6p/PP5P/2q5 w - - bm Ba4; c0 "CCC post by Tim Foden, id CCC.347609, white wins"; id "ZPTS.22"; 6Q1/8/8/7k/8/8/3p1pp1/3Kbrrb w - - bm Qg7; c0 "CCC post by Joachim Rang, mate in 4"; id "ZPTS.23"; 8/8/8/2p5/1pp5/brpp4/1pprp2P/qnkbK3 w - - bm h3; c0 "CCC post by Joachim Rang, mate in 15, h4 is only draw"; id "ZPTS.24"; 8/1B6/8/5p2/8/8/5Qrq/1K1R2bk w - - bm Qa7; c0 "CCC post by Tim Foden, id CCC.321759, mate in 3"; id "ZPTS.25"; 8/3p1p2/5Ppp/K2R2bk/4pPrr/6Pp/4B2P/3N4 w - - bm Nc3; c0 "CCC post by Tim Foden, id CCC.321751, mate in 4: 1.Nc3 e3 2.Rb5 d6 3.Nd5 Bxf4 4.Nxf4#"; id "ZPTS.26"; 8/8/p5p1/p2N3p/k2P3P/5P2/KP1qB3/8 w - - bm f4; c0 "white wins, derived from the more difficult ZPTS.28, Zugzwang after f4"; id "ZPTS.27"; 8/p5pq/8/p2N3p/k2P3P/8/KP3PB1/8 w - - bm Be4; c0 "Kubbel 1925, 1.Be4!! Qh6 2.Bd3!! Qd2 [2...Qd6 3.b3#] 3.Be2 g6 [3...Qc2 4.Bd1 Qxd1 5.Nc3 -; 3...a6 4.f3 g6 5.f4 -] 4.f3 a6 5.f4 Qc2 6.Bd1, Zugzwang after f4, white wins"; id "ZPTS.28"; 8/5p2/4b1p1/7R/5K1P/2r3B1/7N/4b1k1 w - - bm Nf3+; c0 "Noam Elkies 1984, 1 Nf3+! Rxf3+! 2 Kxf3 Bg4+! 3 Kf4!! Bxg3+ 4 Kxg4 gxh5+ 5 Kh3!! Kf1 6 Kxg3 Ke2 7 Kf4 f6 8 Kf5 Kf3 9 Kxf6 Kg4 10 Ke5 Kh4 11 Kf4, draw"; id "ZPTS.29"; 5R2/2K5/1pP5/4k2p/3pp3/2p4N/B4N1b/n1R1B2b w - - bm Rxc3; c0 "CCC post by Tim Foden, id CCC.321966, mate in 4"; id "ZPTS.30";
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