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Subject: Re: Elegant puzzle

Author: Stan Arts

Date: 13:52:44 10/19/03

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>[D] 4K2b/B3P2N/1Q1PP1N1/1R1p3r/1r1pk1B1/6P1/b1P1PP2/n7 w - - 0 1
>
>White Mates in 4.

Hello

Thank you for the position.

Neurosis 1.4 (next version) on a slow PIII-550 with 32 MB hash.

Legal moves: 36
Ply Score Time     Nodes      Best move and expected line
------------------------------------------------------------
2   1888  0        1139       Bf3+ Kf5 Bxh5
3   1802  5        1785       Bf3+ < - > Kf5 e3 dxe3
3   1771  5        2645       Bf3+ Kf5 Bxh5 Rxb5
3   1784  5        3439       Rxb4 < + > Re5 d7 Rxe6
3   2045  5        4705       Rxb4 < + > Nxc2 Bxh5 Nxb4
3   2084  11       5639       Rxb4 Nxc2 Bf3+ Kf5
4   2088  27       21076      Rxb4 Nxc2 Bxh5 Nxb4 Bf3+ Kf5 Nxh8
5   2139  115      74172      Rxb4 < + > Rf5 d7 Rf7
5   2389  143      94676      Rxb4 < + > Rf5 d7 Rxf2
5   2543  242      174067     Rxb4 Bc4 Bxh5 Nxc2 Kd7 Bb5+ Qxb5
5   2544  269      201389     Bxh5 < + > Bf6 Rxb4 Kf5
5   2702  291      224206     Bxh5 Bf6 Kf7 Kf5 e8=Q
6   2779  610      478446     Bxh5 < + > Bf6 Kf7 d3
6   3034  615      487657     Bxh5 < + > Bf6 Kf7 d3
6   3034  813      676357     Bxh5 Bf6 Kf7 d3 Nxf6+ Kf5 e4+ Rxe4 g4+ Kg5
6   9991  824      688992     Rxb4 (Mate in 5) < + > Nxc2 Qxd4+ Nxd4
6   9991  884      745022     Rxb4 (Mate in 5) Nxc2 Qxd4+ Nxd4 Rxd4+ Bxd4 Nf6+
Bxf6 f3+
7   9991  2532     2153390    Rxb4 (Mate in 5) Nxc2 Qxd4+ Nxd4 Rxd4+ Bxd4 Nf6+
Bxf6 f3+
7   9993  7723     6302895    Qc5 (Mate in 4) < + > Rxh7 Qc3 Rxe7+
7   9993  8003     6514279    Qc5 (Mate in 4) Rxh7 Qc3 Rxe7+ dxe7 Bg7 f3+
Total nodes:9892453 n/sec:78755  (Q-nodes:392307 max depth:14)

There are a few ways to mate, and my program has a little more trouble
finding the more quiet(ish) mate in 4 over the mate in 5 that has
previous direct checks in the main line.

greetings, and goodnight
Stan



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