Test position Kaidanov-J.Polgar

[yanquis1972]

according to my IDeA tree, in that line exf2!? (better is e2!). haven't tested that, but that's what it come up with during the analysis (-.44 for exf2 vs -1.02 for e2). and until further notice Qd6 seems to be the best response to e3.

[Marc MP]

according to my IDeA tree, in that line exf2!? (better is e2!). haven't tested that, but that's what it come up with during the analysis (-.44 for exf2 vs -1.02 for e2). and until further notice Qd6 seems to be the best response to e3.

You're right to say that 4...e2 is quite a good move. I let Fritz 8 run overnight here pondering what to do for white:

[d]b4r1k/P5bp/5q2/2Q3R1/5p2/2P5/1P2pPPP/3R2K1 w - - 0 1

Code: Select all

5.Re1 f3 6.Rg4 Rd8 7.Rd4 Rg8 8.Qh5 Qe7 9.Rd3 Bf8 10.g3 Qxa7 11.Rd8 Bc6 12.Qe5+ Qg7 13.Qe6 
  µ  (-1.34)   Depth: 20/69   03:48:36  12546mN, tb=1

[d]3R1brk/q6p/2b5/7Q/8/2P2pP1/1P2pP1P/4R1K1 w - - 2 1

Surely it is possible to improve upon Fritz 8 analysis, but White is quite bottled up.

[Eelco de Groot]

StockFish & IvanHoe both initially saw a perpetual check after 1... e3 2.Qc4 Kh8 3.Qc5 Qf6 4.Rg5 ef2+ 5.Kf2 f3 6.g3:

[d]b4r1k/P5bp/5q2/2Q3R1/8/2P2pP1/1P3K1P/3R4 b - - 0 1

6...Qe6 7.Re1 Qb3 8.Rxg7 Qxb2+ 9.Ke3 Kxg7 10.Qg5+ Kf7 11.Qf4+ Kg8 12.Qg4+ Kh8 13.Qd4+ Kg8 14.Qg4+

But when I start back Stockfish from the last diagram, it finds attacking continuations for black:

Code: Select all

	0,00	16	12992393	Qe6 Re1 Qb3 Rxg7 Qxb2+ Ke3 Kxg7 Qg5+ Kh8 Qe5+ Kg8 Qg5+ Kf7 Qf4+ Kg8 Qg5+ 

        0,20	16	18590864	Qh6 h4 Qe6 Qe3 Qh3 Rd2 Qg2+ Ke1 f2+ Rxf2 Qh1+ Ke2 Rd8 Rf1 Qb7 b4 Qa6+ b5 Qa2+ Ke1 Qc2 

	0,08	17	27711696	Qh6 h4 Qe6 Re1 Qd7 Qe3 Bf6 Rh5 Bb7 b4 Qh3 Qd3 Qg2+ Ke3 Rf7 Rf5 Kg7 Rxf6 Rxf6 Qd7+ Rf7 Qg4+ Kh8 a8R+ Bxa8 Qc8+ Kg7 Qxa8 Qxg3 

	0,80	18	76088648	Qh6 h4 Qe6 Re1 Qd7 Qe3 Bf6 g4 Qa4 Kf1 Bxg5 Qxg5 Qa6+ Kf2 Qxa7+ Re3 Qb8 Qe5+ Qxe5 Rxe5 Rd8 Re7 Rd2+ Ke1 f2+ Kf1 Bd5 Re2 Rxe2 Kxe2 

	0,84	19	138358560	Qh6 h4 Qe6 Qe3 Qh3 Rd2 Qg2+ Ke1 f2+ Rxf2 Qh1+ Ke2 Rd8 Rf1 Qb7 Rc1 Qg2+ Ke1 Rf8 Qe2 Qg1+ Kd2 Qxa7 Rf1 Rd8+ Ke1 Qa1+ Kf2 Rf8+ Kg1 Rxf1+ Qxf1 

	1,05	20	209788653	Qh6 Rh5 Qg6 Qg5 Qf7 Rh4 Qxa7+ Qe3 Qb8 Qd2 Bc6 Re1 Bf6 Rd4 Qb5 h4 Kg8 Rd3 Bg7 Re7 Qb6+ Kf1 

	0,60	21	336181761	Qh6 Rh5 Qg6 Qg5 Qf7 Rh4 Qxa7+ Qe3 Qb8 Rd2 Re8 Qc5 Bf8 Qd4+ Bg7 Qc5 

So maybe whether 1... e3 or 1...Bxd5 is best, will depend on king safety evaluation?

I have not checked the variation itself, but from the second diagram I think Black has a good position, maybe even winning. It is not sure that Black can get here though.

I was mainly curious what the differences in evaluation would be at the moment compared to Stockfish. I also tried a little shoot-out, from a similar variation, and that was fun to watch! Polgar would have won this time if she would have played this well , and it shows that the Bishop is indeed a strong piece, White slowly was ground down and mated. If White had not exchanged Queens for 20 more moves at the end it would have been a draw by the 50 move rule. But probably it was not possible, at least not by a perpetual.


[Event "Sicilian Theme Match"]
[Site "Hilton Head USA"]
[Date "2010.2.22"]
[Round "1"]
[White "Kaidanov, G."]
[Black "Polgar, Ju"]
[WhiteElo "2583"]
[BlackElo "2687"]
[Result "1-0"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5
6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Bxf6 gxf6 10. Nd5 f5
11. Bd3 Be6 12. c3 Bg7 13. Nxb5 axb5 14. Bxb5 Bd7 15. exf5
Nb8 16. a4 O-O 17. O-O Bxf5 18. Qf3 Be6 19. Ne7+ Qxe7
20. Qxa8 d5 21. a5 Nd7 22. Qa7 Qd6 23. a6 e4 24. Bxd7 Bxd7
25. Qe3 f5 26. Rfd1 Bc6 27. a7 Ba8 28. Qe2 Qc5 29. Qa6 f4
30. Ra5 Qe7 31. Raxd5 e3 32. Qd6 (32. Qc4 Kh8 33. Qc5 Qf6
34. Rg5 exf2+ 35. Kxf2 f3 36. g3 Qh6 37. h4 Qe6 38. Re1 Qd7
39. Qe3 Bf6 40. g4 Qc7 41. Rh1 Qb7 42. Rh2 Bxg5 43. hxg5
Qxb2+ 44. Kg3 Qb7 45. Rf2 Kg8 46. Kh3 Qd7 47. Rb2 Qf7
48. Qf2 Qf4 49. Rb5 Be4 50. Ra5 {Shootout from this position,
this was an analysis-line. Fixed depth ten plies, for the endgame
that was of course not very much, but the eval was already good for Black.}
-2.26/10 1:07m} Qc7 {+2.34/10 32s} 51. Ra4 {-2.18/10 33s} Qe5
{+2.70/10 1:17m} 52. Rd4 {-2.70/10 1:28m} Bd5 {+2.74/10 46s}
53. Kh4 {-2.98/10 10s} Be6 {+3.11/10 6s} 54. Ra4 {-3.03/10 1:26m}
Ra8 {+3.11/10 20s} 55. Qxf3 {-3.07/10 12s} Rxa7 {+3.11/10
3s} 56. Rxa7 {-3.11/10 1s} Qh2+ {+3.15/10 0s} 57. Qh3
{-3.11/10 0s} Qf2+ {+2.98/10 0s} 58. Qg3 {-3.23/10 1s} Qxa7
{+3.23/10 0s} 59. Qf4 {-3.19/10 4s} Qc5 {+3.23/10 4s}
60. Qe4 {-3.23/10 3s} Bf7 {+3.27/10 4s} 61. Qe1 {-3.39/10
1s} Qc7 {+3.39/10 0s} 62. Qd2 {-3.39/10 1s} Qe5 {+3.39/10
0s} 63. Kh3 {-3.71/10 1s} Be6 {+3.71/10 3s} 64. Kh4
{-4.00/10 12s} Kf7 {+4.00/10 1s} 65. Qf2+ {-4.00/10 5s} Kg7
{+3.95/10 2s} 66. Qg1 {-3.91/10 1s} Kg8 {+4.08/10 7s}
67. Qf2 {-4.00/10 1s} Qxc3 {+4.16/10 1s} 68. Qe2 {-4.24/10
1s} Qc4 {+4.24/10 0s} 69. Qf3 {-4.24/10 0s} Qd4 {+4.28/10
2s} 70. Qe2 {-4.24/10 2s} Kf7 {+4.24/10 1s} 71. Qf3+
{-4.28/10 1s} Kg7 {+4.32/10 0s} 72. Qe2 {-4.24/10 0s} Qf4
{+4.28/10 1s} 73. Qb2+ {-4.20/10 0s} Kg8 {+4.24/10 0s}
74. Qe2 {-4.20/10 2s} Kf7 {+4.28/10 1s} 75. Qg2 {-4.32/10
0s} Ke7 {+4.24/10 7s} 76. Qe2 {-4.24/10 3s} Kf8 {+4.24/10
4s} 77. Qg2 {-4.28/10 2s} Qe5 {+4.28/10 1s} 78. Qa8+
{-4.20/10 4s} Kg7 {+4.28/10 0s} 79. Qb7+ {-4.20/10 0s} Kh8
{+4.36/10 3s} 80. Qa8+ {-4.28/10 0s} Bg8 {+4.20/10 0s}
81. Qg2 {-4.24/10 0s} Bd5 {+4.24/10 0s} 82. Qf2 {-4.28/10
0s} Kg7 {+4.28/10 1s} 83. Qa7+ {-4.28/10 2s} Kf8 {+4.24/10
4s} 84. Qg1 {-4.32/10 1s} Kf7 {+4.36/10 3s} 85. Qf2+
{-4.32/10 5s} Ke8 {+4.32/10 0s} 86. Qc2 {-4.28/10 2s} Qe1+
{+4.32/10 6s} 87. Kh3 {-4.36/10 3s} Qe4 {+4.36/10 5s}
88. Qc8+ {-4.40/10 11s} Ke7 {+4.40/10 3s} 89. Qc7+
{-4.36/10 4s} Ke6 {+4.36/10 2s} 90. Qc8+ {-4.36/10 7s} Kd6
{+4.40/10 6s} 91. Qb8+ {-4.44/10 11s} Kc5 {+4.44/10 7s}
92. Kh4 {-4.40/10 5s} Qh1+ {+4.44/10 26s} 93. Kg3 {-4.36/10
2s} Qe1+ {+4.60/10 12s} 94. Kh3 {-4.28/10 4s} Be4 {+4.60/10
5s} 95. Qe5+ {-4.56/10 8s} Kc4 {+4.60/10 14s} 96. Qf6
{-4.36/10 3s} Qc3+ {+4.60/10 9s} 97. Kh4 {-4.56/10 0s} Qe3
{+4.76/10 5s} 98. Qe6+ {-4.68/10 3s} Kd3 {+4.72/10 4s}
99. Qa6+ {-4.92/10 4s} Kd2 {+4.92/10 2s} 100. Qf6 {-5.13/10
1s} Ke2 {+5.29/10 32s} 101. Qe5 {-5.65/10 0s} Kf1 {+5.81/10
7s} 102. Qg3 {-5.93/10 0s} Qxg3+ {+6.42/10 0s} 103. Kxg3
{-6.30/10 0s} Ke2 {+5.97/10 0s} 104. Kf4 {-6.02/10 0s} Bg6
{+6.18/10 0s} 105. Kg3 {-6.58/10 0s} Ke3 {+6.06/10 0s}
106. Kh4 {-5.93/10 0s} Kf3 {+6.06/10 0s} 107. Kh3 {-6.10/10
0s} Bc2 {+6.42/10 0s} 108. Kh4 {-7.03/10 0s} Kg2 {+7.43/10
0s} 109. Kh5 {-11.67/10 0s} Kh3 {+12.85/10 0s} 110. g6
{-14.86/10 0s} Bxg6+ {+22.86/10 0s} 111. Kg5 {-42.02/10 0s}
Kg3 {+89.09/10 0s} 112. Kf6 {-89.19/10 0s} Kxg4 {+89.29/10
0s} 113. Ke5 {-89.29/10 0s} h5 {+89.29/10 0s} 114. Kd4
{-89.39/10 0s} Kf4 {+93.52/10 0s} 115. Kd5 {-93.52/10 0s}
h4 {+93.57/10 0s} 116. Kd4 {-93.62/10 0s} h3 {+93.74/10 0s}
117. Kd5 {-M9/10 0s} h2 {+M8/10 1s} 118. Kd4 {-M7/10 0s}
h1=Q {+M7/10 1s} 119. Kc5 {-M6/10 0s} Qb7 {+M5/10 0s}
120. Kc4 {-M4/10 0s} Qb6 {+M4/10 0s} 121. Kc3 {-M3/10 0s}
Ke3 {+M3/10 0s} 122. Kc4 {-M2/10 0s} Bf7+ {+M2/10 0s}
123. Kc3 {-M1/10 0s} Qb3# {[d]8/5b2/8/8/8/1qK1k3/8/8 w - -
+M1/10 0s}) 32... exf2+ 33. Kf1 Qe3 34. R5d3 Bxg2+
35. Kxg2 f3+ 36. Kh3 Qe2 37. a8=Q f1=Q+
38. Rxf1 Qxf1+ 39. Kh4 Qe1+ 40. Kh5 1-0


[d]b4r1k/P5bp/5q2/2Q3R1/8/2P2pP1/1P3K1P/3R4 b - -

Engine: Rainbow Serpent 1.6.3s(dc) Build 162 (Athlon 2009 MHz, 256 MB)
by Tord Romstad, Marco Costalba, Joona Kiiski Modifications: Dann Corbit

1.00 0:00 +4.32 36...Qe6 (133) 0

2.00 0:00 +0.76 36...Qe6 37.Re5 (276) 1

2.00 0:00 +1.29 36...Be4 37.Qe3 (2.271) 9

3.00 0:00 +0.84 36...Be4 37.Qe3 Bc6 (18.984) 67

4.00 0:00 -2.82 36...Be4 37.Rxg7 Qxg7 38.Qd4 Re8
39.Qxg7+ Kxg7 (158.027) 288

4.00 0:00 -2.50 36...Re8 37.Rf5 Re2+ 38.Kf1 Qg6
39.Rd8+ Re8 40.Rxe8+ Qxe8 (165.946) 294

4.00 0:00 +0.20 36...Bh6 37.Rf5 Qxf5 38.Qxf5 Rxf5
39.Rd7 Kg8 40.b4 Be4 (218.950) 325

4.00 0:00 +0.80 36...Qh6 37.h4 Qe6 38.Re5 (235.957) 335

5.00 0:00 +0.16 36...Qh6 37.h4 Qa6 38.Qe7 Bh6 (289.267) 355

5.00 0:01 +0.96 36...Bh6 37.Rf5 Qxf5 38.Qxf5 Rxf5
39.b4 Kg7 40.Rd8 Rf8 41.Rxf8 Kxf8 (391.699) 391

5.10 0:01 +4.68 36...Qe6 37.Qe3 Qh3 38.Rf1 Bc6 (653.945) 422

6.01 0:01 +4.32 36...Qe6 37.Qe3 Qh3 38.Rf1 Qxh2+
39.Ke1 Qxb2 40.Rxg7 Qa1+ 41.Kd2 Rd8+
42.Kc2 Qxf1 43.Rd7 Qg2+ 44.Rd2 Be4+
45.Qxe4 Rxd2+ 46.Kc1 (778.254) 436

7.01 0:05 +4.80 36...Qe6 37.Qb5 Bc6 38.Qa6 Re8
39.Rxg7 Kxg7 40.a8Q Rxa8 41.Qd3 (2.957.939) 506

8.01 0:08 +5.21 36...Qe6 37.Qb5 Bc6 38.Qa6 Re8
39.Rxg7 Kxg7 40.Qd3 Qh3 41.Qd4+ Kg6
42.Qd6+ Re6 43.Qd3+ Kf7 (4.241.487) 511

9.01 0:11 +3.91-- 36...Qe6 37.Qb5 Bc6 38.Qf1 Qa2
39.Qd3 Qxa7+ 40.Qe3 Qxe3+ 41.Kxe3 f2
42.Rf1 (5.862.716) 524

10.01 0:21 +4.68 36...Qe6 37.Qb5 Re8 38.Rf5 Bxc3
39.Rxf3 Be1+ 40.Kf1 Bxf3 41.Qxe8+ Qxe8
42.Rxe1 Qf7 43.Ra1 Qc4+ 44.Kg1 Qd4+
45.Kf1 Qxb2 46.a8Q+ Bxa8 47.Rxa8+ Kg7
48.Kg1 (11.751.051) 543

11.01 0:31 0.00 36...Qe6 37.Re1 Qb3 38.Rxg7 Qxb2+
39.Ke3 Kxg7 40.Qg5+ Kh8 41.Qe5+ Kg8
42.Qe6+ Kh8 43.Qe5+ (17.579.443) 560

11.02 0:42 +2.06 36...Qh6 37.Rh5 Qg6 38.Rf5 Qxf5
39.Qxf5 Rxf5 40.h3 Kg8 41.g4 Rd5
42.Rxd5 Bxd5 43.Ke3 Kf7 44.c4 Ba8 (23.780.750) 560

12.01 0:50 +2.38 36...Qh6 37.Rh5 Qg6 38.Rf5 Qxf5
39.Qxf5 Rxf5 40.g4 Rf8 41.g5 Kg8
42.Rd7 Re8 43.h4 Kf8 44.Kf1 Bc6
45.Rc7 Be4 46.Rd7 Ba8 47.h5 Re2
48.Rd8+ Ke7 49.Rxa8 Rxb2 (28.535.525) 563

13.01 2:33 +2.38 36...Qh6 37.Rh5 Qg6 38.Qg5 Qb6+
39.Qe3 Qxb2+ 40.Rd2 Qc1 41.Rf5 Rg8
42.Rfd5 Bxd5 43.Rxd5 Qa1 44.c4 Rf8
45.Rd2 (84.682.913) 551

14.01 3:40 +2.70++ 36...Qh6 37.Rh5 Qg6 38.Qg5 Qb6+
39.Qe3 (120.808.195) 546

15.01 4:32 +1.41-- 36...Qh6 37.h4 Qe6 38.Re1 Qd7 39.Qe3 Qh3
40.Qe7 Qg2+ 41.Ke3 Rg8 42.Kd3 (149.325.695) 548

16.01 15:43 +1.53 36...Qh6 37.h4 Qe6 38.Re1 Qd7 39.Qe3 Bf6
40.g4 Qc7 41.Rh1 Qb7 42.b4 Qf7
43.Ra1 Bxg5 44.hxg5 Kg8 45.Ra6 Re8
46.g6 hxg6 47.Qh6 Be4 48.b5 Qd5
49.a8B Rxa8 (523.232.874) 554

17.01 46:09 +1.89 36...Qh6 37.h4 Qe6 38.Re1 Qd7 39.Qe3 Bf6
40.g4 Qc7 41.Rh1 Qb7 42.b4 Qf7
43.Ra1 Bxg5 44.hxg5 Kg8 45.Ra6 Re8
46.g6 hxg6 47.Qh6 Re2+ 48.Kf1 Re6
49.Rxe6 Qxe6 (1.605.386.935) 579

18.01 69:54 +1.97 36...Qh6 37.h4 Qe6 38.Re1 Qd7 39.Qe3 Bf6
40.g4 Qc7 41.Rh1 Qb7 42.Rh2 Bxg5
43.hxg5 Qxb2+ 44.Kg3 Qb7 45.Rf2 Kg8
46.Kh3 Qd7 47.Rb2 Qf7 48.Qf2 Qf4
49.Rb5 Be4 (2.432.036.926) 579

19.01 223:57 +1.45-- 36...Qh6 37.Rh5 Qg6 38.Qg5 Qb6+
39.Qe3 Qxb2+ 40.Rd2 Qa1 41.Re5 Qh1
42.Re8 Qxh2+ 43.Ke1 f2+ 44.Rxf2 (7.789.789.425) 579

20.01 323:08 +1.89 36...Qh6 37.Rh5 Qg6 38.Qg5 Qe8
39.Rd2 Qf7 40.Rh4 Bf6 41.Qh6 Qxa7+
42.Kf1 Rf7 43.Rg4 Qa6+ 44.c4 f2
45.Rf4 Qb7 46.Qh3 Qc6 47.Kxf2 Ra7
48.Rd1 Ra2 49.Rb1 Qc5+
{[d]b6k/7p/5b2/2q5/2P2R2/6PQ/rP3K1P/1R6 w - -
This looks won for Black} (10.535.848.985) 543

best move: Qf6-h6 time: 423:35.922 min n/s: 548.129 nodes: 13.931.220.291

[yanquis1972]

either stockfish seems to have great difficulty seeing e3 does not lead to a perpetual, or it's found one rybka missed. i havent checked its line yet, but in 2pv mode its evaluating Bxd5 as +1.41 & e3 as 0.00.