Author: Roy Eassa
Date: 15:29:05 05/21/02
Go up one level in this thread
On May 21, 2002 at 15:26:39, Andreas Herrmann wrote:
>On May 21, 2002 at 01:00:36, Jouni Uski wrote:
>
>>[D]1q1r3k/3P1pp1/ppBR1n1p/4Q2P/P4P2/8/5PK1/8 w - -
>>
>>None of my engines finds Rxf6 in reasonable time e.g. under 30 minutes! What's
>>so
>>special there, is it null-move problem may be? I guess Rebel can find it am I
>>right?
>>
>>Jouni
>
>Hi Jouni,
>
>i'm not sure what's the problem with other programs and i don't know if Rxf6 is
>the best move, but my engine Holmes (with not much chess knowledge implemented)
>found it in ply one under 1 centisecond on my slow K6/2 450.
>What moves want other programs here to play? Perhaps there is a better move.
>
>>1.1 -118 1 135 1.f2f3 [ 14kNs 0:00 n135]
>>1.7 -90 1 285 1.g2g1 [ 28kNs 0:00 n285]
>>1.35 -63 1 355 1.d6f6 [ 36kNs 0:00 n355]
>>2.35 -63 1 430 1.d6f6 [ ! 43kNs 0:00 n430]
>>2.1 2 1 492 1.d6f6 b8e5 [ 49kNs 0:00 n492]
>>3.1 2 1 671 1.d6f6 b8e5 2.f4e5 [ 67kNs 0:00 n671]
>>4.1 39 4 3629 1.d6f6 b8e5 2.f6h6 g7h6 3.f4e5 [ 91kNs 0:00 n3629]
>>5.1 39 7 7371 1.d6f6 b8e5 2.f6h6 g7h6 [ 105kNs 0:00 n7371]
>>6.1 50 29 27743 1.d6f6 b8e5 2.f6h6 g7h6 3.f4e5 d8g8 4.g2f3 h8g7 [ 96kNs 0:00 n27743]
>>7.1 43 62 58564 1.d6f6 b8e5 2.f6h6 g7h6 3.f4e5 d8g8 4.g2f3 h8g7 5.f3e4 [ 94kNs 0:00 n58564]
>>8.1 55 162 168642 1.d6f6 b8e5 2.f6h6 g7h6 3.f4e5 d8g8 4.g2f3 h8h7 5.f3e4 h7g7 [ 104kNs 0:01 n168642]
>>9.1 103 323 342310 1.d6f6 b8e5 2.f6h6 g7h6 3.f4e5 d8g8 4.g2h1 h8h7 5.f2f4 h7g7 6.f4f5 [ 106kNs 0:03 n342310]
>>10.1 81 747 777524 1.d6f6 b8e5 2.f6h6 g7h6 3.f4e5 d8g8 4.g2f1 h8g7 5.f2f4 a6a5 6.f4f5 g7h8 [ 104kNs 0:07 n777524]
>>11.1 85 2155 2348988 1.d6f6 b8e5 2.f6h6 g7h6 3.f4e5 a6a5 4.f2f4 h8g7 5.g2f3 d8b8 6.f4f5 b8g8 [ 109kNs 0:21 n2348988]
>>12.1 93 5773 6100419 1.d6f6 b8e5 2.f6h6 g7h6 3.f4e5 d8g8 4.g2f3 h8g7 5.f3e4 a6a5 6.f2f4 g8b8 7.f4f5 b8g8 [ 106kNs 0:57 n6100419]
>
>have a nice day
>Andreas
>
>http://wbholmes.de
But the main line you show gives the wrong second move for White. To win, White
should _avoid_ playing 2.Rxh6+ and instead recapture the Queen.
Here's a bit of analysis:
1.Rxf6!
[1.Qd4 Qc7 2.Rxf6 gxf6 3.Qxf6+ Kg8 4.Qxh6 Rxd7 5.Qg5+ Kf8 6.Bxd7 Qxd7
7.h6 Qd4 8.f5 Qe4+ 9.Kg3 Qe5+ 10.Kh3 Qd5 11.Qg7+ Ke8 12.Kg3 Qd3+
and I don't know if White can win]
1...Qxe5 2.fxe5!
[2.Rxh6+ gxh6 3.fxe5 Kg7 4.f4 Kf8 and I doubt White can win]
2...gxf6 3.exf6 and Black's King is locked out so White uses his King to win at
will.
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