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Subject: Is this move really the best?

Author: Stefan Meyer-Kahlen

Date: 06:07:42 05/02/00


In my set of tactical test positions there is the following example:

[D] 2rqk2r/pb1nbp1p/4p1p1/1B1n4/Np1N4/7Q/PP3PPP/R1B1R1K1 w k – bm Rxe6

I can’t remember where I have found this position, but the solution is supposed
to be Rxe6. Until know every version of Shredder has found this move sooner or
later and kept it as a best move until the end of my test time.

Last night I have tested my latest version and found something interesting.
Shredder played Rxe6 after a while as usual, but got a terrible fail low for
that move at ply 11.

So here is my question:
Is Rxe6 really the best move and I have introduced a bug somewhere in my code or
is Rxe6 a mistake? I didn’t find an improvement for white after 1. Rxe6 fxe6,
but this can be due to my limited chess knowledge.

Here is Shredder’s output:

 6.01   0:00.71  -0.23   1.Bh6 a6 2.Bd3 Bf6 3.Nf3 a5 (63.557) 88.3
 6 ->   0:01.76  -0.23   1.Bh6 a6 2.Bd3 Bf6 3.Nf3 a5 (159.299) 90.2
 7.01   0:02.71  -0.09   1.Bh6 a6 2.Bd3 Bf6 3.Nb3 N5b6 4.Nxb6 Qxb6
                         (240.167) 88.3
 7 ->   0:04.90  -0.09   1.Bh6 a6 2.Bd3 Bf6 3.Nb3 N5b6 4.Nxb6 Qxb6
                         (435.029) 88.6
 8.01   0:07.96  -0.01   1.Bh6 a6 2.Bf1 N7f6 3.Rad1 Qa5 4.Bg7 Nf4
                         (704.124) 88.3
 8 ->   0:10.15  -0.01   1.Bh6 a6 2.Bf1 N7f6 3.Rad1 Qa5 4.Bg7 Nf4 (911.624) 89.7
 9.01   0:17.93  -0.17   1.Bh6 a6 2.Be2 Bg5 3.Bf3 Nf4 4.Qg3 Bxh6 5.Bxb7
                         (1.594.580) 88.8
 9 ->   0:32.29  -0.17   1.Bh6 a6 2.Be2 Bg5 3.Bf3 Nf4 4.Qg3 Bxh6 5.Bxb7
                         (2.918.536) 90.3
10.01   0:42.76  -0.14   1.Bh6 a6 2.Be2 Qa5 3.b3 e5 4.Nf3 e4 5.Nd2 f5
                         (3.876.621) 90.6
10.08   2:02.76  -0.13++ 1.Rxe6 fxe6 2.Nxe6 Qa5 3.Bxd7+ Kxd7 4.Nec5+ Ke8 5.Qd7+
                         Kf8 6.Nxb7 (11.210.309) 91.3
10.08   2:26.60  +0.22++ 1.Rxe6 fxe6 2.Nxe6 Qa5 3.Bxd7+ Kxd7 4.Nec5+ Ke8 5.Qd7+
                         Kf8 6.Bh6+ Kf7 7.Nxb7 a6 8.Nxa5 Rc1+ 9.Rxc1
                         (13.366.273) 91.1
10.08   3:25.78  +0.40   1.Rxe6 Rc7 2.Re2 O-O 3.Bh6 Re8 4.Rae1 a6 5.Bd3 a5 6.b3
                         (18.827.259) 91.4
10 ->   3:45.35  +0.40   1.Rxe6 Rc7 2.Re2 O-O 3.Bh6 Re8 4.Rae1 a6 5.Bd3 a5 6.b3
                         (20.541.368) 91.1
11.01   5:35.76  +0.15-- 1.Rxe6 fxe6 2.Nxe6 Qa5 3.Bxd7+ Kxd7 4.Nec5+ Ke8 5.Qd7+
                         Kf7 6.Nxb7 Rc7 7.Nd6+ Kg7 8.Ne8+ Rxe8 9.b3 Rxc1+
                         (31.352.209) 93.3
11.01   9:18.76  -0.35-- 1.Rxe6 fxe6 2.Nxe6 Qa5 3.Bxd7+ Kxd7 4.Nec5+ Ke8 5.Qd7+
                         Kf7 6.Nxb7 Rc7 7.Nd6+ Kg7 8.Ne8+ Rxe8 9.Qxe8 Nf6
                         10.Qb8 Bd6 (54.470.299) 97.4
11.01  14:41.53  -1.36   1.Rxe6 fxe6 2.Nxe6 Qa5 3.Bxd7+ Kxd7 4.Nec5+ Ke8 5.Qd7+
                         Kf7 6.Nxb7 Rc7 7.Nxa5 Rxd7 8.Nc6 Rc7 9.Nxe7
                         (86.129.099) 97.7
11.02  14:52.57  -1.35++ 1.Bh6 a6 2.Be2 Qa5 3.b3 Nf4 4.Bxf4 Bxg2 5.Qxg2
                         (87.133.005) 97.6
11.02  15:07.65  -1.00++ 1.Bh6 a6 2.Bxd7+ Qxd7 3.Nxe6 Qxa4 4.Ng7+ Kd8 5.Qd7+
                         Qxd7 (88.458.785) 97.4
11.02  16:23.21  -0.10   1.Bh6 a6 2.Bxd7+ Qxd7 3.b3 e5 4.Qxd7+ Kxd7 5.Rxe5 Bf6
                         6.Rxd5+ Bxd5 7.Nb6+ Kd6 8.Nxc8+ Kd7 9.Re1
                         (95.283.049) 96.9

(I have formatted it a bit, hopefully it helps...)

Stefan

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