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Subject: Re: Tough problems from "Chess IQ" - can you solve them in a reasonable time

Author: Slater Wold

Date: 18:35:04 10/24/01

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With Crafty 18.12 and 10 minutes a position I got 5:

total: 9
total acd: 131   mean total acd: 14.56
total acn: -1027728761   mean total acn: -114192084.56
total acs: 5428   mean total acs: 603.11
total mean node frequency: -189338.39 Hz
solve: 5   solve percent: 55.56
solve acd: 73   mean solve acd: 14.60
solve acn: -269231411   mean solve acn: -53846282.20
solve acs: 3014   mean solve acs: 602.80
solve mean node frequency: -89326.94 Hz
unsol: 4   unsol percent: 44.44
unsol acd: 58   mean unsol acd: 14.50
unsol acn: -758497350   mean unsol acn: -189624337.50
unsol acs: 2414   mean unsol acs: 603.50
unsol mean node frequency: -314207.68 Hz

Here's the out file:

r2q1r2/p1pbppbk/1p3npp/n2P2B1/7Q/2NB1N2/PPP3PP/4RRK1 w - - acd 12; acn
833818374; acs 604; bm d6; ce 48; id "IQ.1004"; pv Ne5 Be8 b4 Nb7 Nc6 Bxc6 dxc6
Nd6 Rd1 Ng8 Nd5 Bd4+ Ne3 Re8;
1k5r/1b5r/1b1qn3/1P2p1pP/3pPpP1/1N1Q4/6B1/1R2BRK1 b - - acd 15; acn 761387696;
acs 604; bm f3; ce -2; id "IQ.1006"; pv f3 Bxf3 Nf4 Qc4 Rc7 Qb4 Qe6 Nd2 d3+ Bef2
Nh3+ Kg2 Nxf2 Rxf2 Bxf2 Kxf2;
1rb2r2/1p1nppk1/2p1n1p1/p3P2p/2qP3R/2N3NP/PP1Q2B1/5RK1 w - - acd 13; acn
835940821; acs 604; bm Bd5 "IQ.926" id; ce 175; pv Bd5 Qxf1+ Nxf1 cxd5 Nxd5 b6
Nxe7 Bb7 Ne3 Rfe8 N7d5 Bxd5 Nxd5 f6 Qf2 fxe5 dxe5 Nxe5 Nxb6;
2k3r1/pp6/2b1p3/2P1q3/1PP3Bp/3Q3P/P7/3R2K1 b - - acd 15; acn 878368977; acs 604;
bm Qf5 id "IQ.942"; ce 0; pv Ba4 Rf1 Bc6 Qd6 Rxg4+ hxg4 Qe3+ Rf2 Qc1+ Rf1 Qe3+;
1r5r/3b1pk1/3p1np1/p1qPp3/p1N1PbP1/2P2PN1/1PB1Q1K1/R3R3 b - - acd 14; acn
843045491; acs 602; bm "IQ.950" Nxg4 id; ce 638; pv Nxg4 fxg4 Bxg4 b4 axb3 Rxa5
Bxe2 Rxc5 Bxc4 Rxc4 bxc2 Ne2 Rh2+ Kf3 Rxe2 Kxe2 c1=Q Rxc1 Bxc1;
r5k1/1p3pbp/2q1p1p1/p1p1P3/n1P5/P1B2N1P/1P2QPP1/3R2K1 w - - acd 18; acn
869912902; acs 604; bm Bxa5 "IQ.968" id; ce 6; pv Be1 Nb6 Rd6 Qc7 Qe4 h6 Bd2 Nd7
Bf4 a4 Qe3 g5 Bg3 Rd8 Qe4 Bf8 Rd3;
r1b2r2/4ppkp/p2p1np1/qpn5/2PNP1P1/2N2P2/PP1QB2P/R3K2R w KQ - acd 14; acn
796343330; acs 602; bm "IQ.975" g5 id; ce 229; pv g5 Ng8 b4 Qxb4 Nc6 Qa3 Nb1
Nxe4 fxe4 Qh3 Qc3+ Qxc3+ Nxc3 Bh3 cxb5 Bg2 Rg1;
r1b2rk1/1p3pbn/p2p2p1/q1nPp2p/P3P3/2NBBPN1/1P1Q2PP/R4RK1 w - - acd 17; acn
789018547; acs 602; bm "IQ.983" b4 id; ce 71; pv b4 Qxb4 a5 Bh6 Bxh6 Qd4+ Rf2
Qxd3 Qxd3 Nxd3 Bxf8 Kxf8 Rc2 h4 Nge2 Nb4 Rcc1 Nd3;
rnb2rk1/pp2bppp/2p5/q7/4NN2/4B1QP/PPP3P1/2KR3R w - - acd 13; acn 954369693; acs
602; bm "IQ.988" Rd5 id; ce 211; pv Nfd5 cxd5 Bh6 Bg4 Qxg4 g6 Bxf8 Bxf8 Nf6+ Kg7
Qc8 Qa6 Nd7 Nxd7 Qxa8 Qxa2 Qxb7;

And here are the times to solve:

1.  Never
2.  2:27
3.  1:21
4.  Never
5.  46.85
6.  Never
7.  1:24
8.  5:01
9.  Never (I think this one is wrong.)



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