Author: Jon Dart
Date: 17:41:42 06/06/02
This is a recent test game Arasan vs. Pharaon:
[Event "?"]
[Site "-"]
[Date "2002.06.05"]
[Round "?"]
[White "Arasan 6.0"]
[Black "Pharaon 2.62"]
[Result "0-1"]
[ECO "B33"]
[TimeControl "1200+0"]
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e6 5. Nc3 Nf6 6. Ndb5 d6
7. Bf4 e5 8. Bg5 a6 9. Na3 b5 10. Nd5 Be7 11. Bxf6 Bxf6 12. c3 O-O
13. Nc2 Bg5 14. a4 bxa4 15. Rxa4 a5 16. Bc4 Rb8 17. b3 Kh8 18. O-O f5
19. exf5 Bxf5 20. Nce3 Bg6 21. Qg4 Rb7 22. Kh1 Rbf7 23. f3 Rb7
24. Rfa1 Rb8 25. Qe6 e4 26. fxe4 Ne5 27. Rxa5 Bxe3 28. Nxe3 Bf7
29. Qh3 Nxc4 30. Nxc4 Bxc4 31. Rh5 Bg8 32. b4 Qe8 33. e5 Rb5 34. Qh4
Rxe5 35. Rxe5 Qxe5 36. Qe1 Ra8 37. Rc1 Qxe1+ 38. Rxe1 Ra3 39. Rc1 Bd5
40. Kg1 Ra2 41. Rd1 Rxg2+ 42. Kf1 Bb3 43. Kxg2 Bxd1 44. b5 Ba4 45. b6
Bc6+ 46. Kg3 Kg8 47. Kf4 Kf7 48. c4 Ke6 49. Ke3 Bb7 50. Kd4 Kd7
51. Kd3 0-1 {White resigns}
An interesting move here is 25 .. e4 from this position:
[D] 1r1q1r1k/6pp/2npQ1b1/p2Np1b1/R1B5/1PP1NP2/6PP/R6K b - -
Crafty 18.10 doesn't like this move:
25. Qe6 e4
({13:+0.33} 25. ... e4 26. fxe4 Ne5 27. Qh3 Bxe4 28. Rxa5 Nxc4
29. Nxc4 Rf2 30. Qg4 Bxg2+ 31. Kg1 Bf3 32. Qf5 Rg2+ 33. Kf1 $14)
({13:+0.00} 25. ... Be8 26. Qg4 Bg6 $10)
({13:+0.00} 25. ... Bf7 26. Qg4 Bg6 $10)
({13:+0.01} 25. ... Bxe3 26. Nxe3 Bf7 27. Qg4 Bxc4 28. Rxc4 Ne7
29. Ra3 Rf6 30. Rca4 Rc8 31. Nc4 Nd5 32. b4 Rf4 $10)
26. fxe4 Ne5
27. Rxa5
({13:-1.06} 27. Rxa5 Bxe3 28. Nxe3 Bf7 29. Rxe5 Bxe6 30. Rxe6 Q
g5 31. Re1 Rbd8 32. Nf5 Qd2 33. Rf1 Qxc3 34. Rxd6 Rxd6 35. Nxd6 Rxf1+ 36. Bxf1 Q
xb3 $17)
({13:-0.70} 27. Bf1 Rxb3 28. Rxa5 Bxe4 29. R5a4 Bg6 30. Ra8 Rb8
31. Rxb8 Qxb8 32. Kg1 Bxe3+ 33. Nxe3 Rf6 34. Qe7 Be4 $15)
({13:-0.81} 27. Qh3 Nxc4 28. Rxc4 Rxb3 29. Nf5 Rb2 30. Qg4 h5 3
1. Qf3 Rb5 32. Rd4 Bf6 33. Rda4 Bg5 $17)
But notice that by move 27, it sees that as a result of e4 fxe4 Ne5, White can't
do better than -0.70.
Pharaon itself switches to e4, early but the score doesn't start to go up
significantly for quite a while:
7. -28 1 353770 e4 fxe4 Re8 Qh3 Bxe4 Nf5 h6
7-> -28 2 469433 e4 fxe4 Re8 Qh3 Bxe4 Nf5 h6
8. -33 2 802767 e4 fxe4 Re8 Qh3 Bxe4 Nf5 Re5 Nde3
8. -33 5 1573056 Be8!
8. -33 5 1701477 Re8!
8-> -33 6 1934613 e4 fxe4 Re8 Qh3 Bxe4 Nf5 Re5 Nde3
9. -19 7 2533726 e4 fxe4 Re8 Qg4 Bxe4 Rf1 Rb7 Nf5 Rf7
9-> -19 9 3059277 e4 fxe4 Re8 Qg4 Bxe4 Rf1 Rb7 Nf5 Rf7
10. -7 13 4968281 e4 fxe4 Re8 Qg4 Bxe4 Rf1 Re5 Qh3 Qe8 Nf4
10-> -7 16 5944242 e4 fxe4 Re8 Qg4 Bxe4 Rf1 Re5 Qh3 Qe8 Nf4
11. -4 24 9099300 e4 fxe4 Re8 Qg4 Bxe4 Qh5 Rb7 Rd1 Re5 Ng4 Qe8
11-> -4 31 11430433 e4 fxe4 Re8 Qg4 Bxe4 Qh5 Rb7 Rd1 Re5 Ng4 Qe8
12. 8 81 30163019 e4 fxe4 Ne5 Qh3 Bxe4 Be2 Bxd5 Nxd5 Rf2 Bd3 Nxd3 Qxd3
Rxb3 Rxa5
12-> 8 95 35602128 e4 fxe4 Ne5 Qh3 Bxe4
13. 31 188 71214188 e4 fxe4 Ne5 Qh3 Bxe4 Qg3 Nxc4 Rxc4
13-> 31 215 81280627 e4 fxe4 Ne5 Qh3 Bxe4 Qg3 Nxc4 Rxc4
14. 39 538 205827618 e4 fxe4
(Scores here are + for a Black advantage, unlike Crafty: so the score at ply 14
is 0.39 in Black's favor).
So far I'm not sure if e4 is decisively the best move, or if there's a better
defense to it. It is peculiar that both programs expect the PV e4 fxe4 Ne5 Qh3,
but think (for a long while) that the score is even or + for White.
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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