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Subject: Re: Warp - Diep, WCCC

Author: Robert Hyatt

Date: 11:15:38 12/02/02

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On December 02, 2002 at 13:45:57, Peter McKenzie wrote:

>I've been looking at some positions from the Warp-Diep game from the WCCC in
>Maastricht this year.  Here are a few test positions:
>
>[D]7k/p3Qp1p/1p2n3/4nqP1/2P5/2P3R1/P5RP/3r2BK w - -
>
>Warp played Qe8+ followed by Qa4 here, which wasn't very good.
>Qf6+ was suggested and certainly looks like an improvement, although perhaps its
>not so easy to white to make progress there.

Crafty quickly goes for Qxa7 but that fails low a bit and it returns to Qf6+ and
it
sticks there.  Here is the analysis on a quad 550mhz xeon:

                7     0.22   2.55   1. Qf6+ Qxf6 2. gxf6 h5 3. Rg8+ Kh7
                                    4. Re8 Rf1 5. c5 bxc5
                7     0.56   2.78   1. Qxa7 Nf4 2. g6 Rxg1+ 3. Rxg1 Qe4+
                                    4. R3g2 Nxg2 5. g7+ Kxg7 6. Rxg2+
                7->   0.56   2.78   1. Qxa7 Nf4 2. g6 Rxg1+ 3. Rxg1 Qe4+
                                    4. R3g2 Nxg2 5. g7+ Kxg7 6. Rxg2+
                8     1.58   2.92   1. Qxa7 Nxc4 2. Qa8+ Kg7 3. Qf3 Qd5
                                    4. Qxd5 Rxd5 5. h3
                8->   1.69   2.92   1. Qxa7 Nxc4 2. Qa8+ Kg7 3. Qf3 Qd5
                                    4. Qxd5 Rxd5 5. h3
                9     3.01     --   1. Qxa7
                9     4.34   2.38   1. Qxa7 Nf4 2. g6 hxg6 3. Qb8+ Kg7
                                    4. Rg5 Rxg1+ 5. Rxg1 Qe4+ 6. R1g2 Nxg2
                                    7. Qxe5+ Qxe5 8. Rxe5
                9     4.77   2.68   1. Qf6+ Qxf6 2. gxf6 Ng6 3. Re2 Ngf4
                                    4. Re4 Nh5 5. Rf3 Rd2
                9->   5.36   2.68   1. Qf6+ Qxf6 2. gxf6 Ng6 3. Re2 Ngf4
                                    4. Re4 Nh5 5. Rf3 Rd2 (s=3)
               10     6.11   2.73   1. Qf6+ Qxf6 2. gxf6 Rd8 3. c5 bxc5
                                    4. Rb2 h5 5. Be3 Rd1+ 6. Kg2 Kh7 (s=2)
               10->  10.60   2.73   1. Qf6+ Qxf6 2. gxf6 Rd8 3. c5 bxc5
                                    4. Rb2 h5 5. Be3 Rd1+ 6. Kg2 Kh7 (s=3)
               11    13.11   2.68   1. Qf6+ Qxf6 2. gxf6 h6 3. Rg8+ Kh7
                                    4. Ra8 Nc6 5. Rgg8 h5 6. Rae8 Na5 7.
                                    Rh8+ Kg6 8. Re7 Nxc4 9. Rxa7 Kxf6 10.
                                    Rxh5 (s=2)
               11->  28.19   2.68   1. Qf6+ Qxf6 2. gxf6 h6 3. Rg8+ Kh7
                                    4. Ra8 Nc6 5. Rgg8 h5 6. Rae8 Na5 7.
                                    Rh8+ Kg6 8. Re7 Nxc4 9. Rxa7 Kxf6 10.
                                    Rxh5 (s=6)
               12    34.02   2.77   1. Qf6+ Qxf6 2. gxf6 Rd8 3. c5 bxc5
                                    4. Rb2 h5 5. Be3 h4 6. Rh3 Rd1+ 7.
                                    Kg2 Ng6 (s=5)
               12->  42.77   2.77   1. Qf6+ Qxf6 2. gxf6 Rd8 3. c5 bxc5
                                    4. Rb2 h5 5. Be3 h4 6. Rh3 Rd1+ 7.
                                    Kg2 Ng6 (s=2)
               13    52.28   2.83   1. Qf6+ Qxf6 2. gxf6 Rd8 3. c5 bxc5
                                    4. Rb2 h5 5. Rb7 a6 6. Be3 Rd7 7. Rb8+
                                    Kh7 8. Rbg8
               13->   1:22   2.83   1. Qf6+ Qxf6 2. gxf6 Rd8 3. c5 bxc5
                                    4. Rb2 h5 5. Rb7 a6 6. Be3 Rd7 7. Rb8+
                                    Kh7 8. Rbg8 (s=3)




>
>The current Warp however prefers Qxa7, which also looks good.  Personally I like
>Qxa7 better than Qf6.
>What do other engines play here?
>
>[D]8/p4pkp/1p2n3/2P1n1P1/8/1QP3R1/P5RP/2qr2BK b - -
>
>Here Diep played Nf4!! which forces a draw.  How long do other engines take to
>find Nf4 ?
>Warp needs about 11 minutes on my PIII 1Ghz.

Here is Crafty's output.  If it has a 1 minute search time target it will find
this because
it has to finish the current ply-1 move before exiting.  It takes 1:25 to fail
high on Nf4
at at 3:31 the score comes back but not yet as a draw...

               10->   5.32   1.72   1. ... Nxc5 2. Qb4 Re1 3. Qh4 Qb1 4.
                                    Qh3 Qg6 5. Re3 Ncd3 6. Rxe1 Nxe1 (s=2)
               11     7.82   1.60   1. ... Nxc5 2. Qb4 Re1 3. Qh4 Qb1 4.
                                    Qd4 Ne6 5. Qd2 Qd1 6. Rf2 a6
               11->  11.90   1.60   1. ... Nxc5 2. Qb4 Re1 3. Qh4 Qb1 4.
                                    Qd4 Ne6 5. Qd2 Qd1 6. Rf2 a6 (s=2)
               12    25.21   1.56   1. ... Nxc5 2. Qb4 Kg8 3. Rh3 Ng6 4.
                                    Rf3 Kg7 5. Rf6 Rd3 6. Rgf2 Nh8 7. Qh4
                                    Qxc3
               12->  44.87   1.56   1. ... Nxc5 2. Qb4 Kg8 3. Rh3 Ng6 4.
                                    Rf3 Kg7 5. Rf6 Rd3 6. Rgf2 Nh8 7. Qh4
                                    Qxc3 (s=3)
               13    54.96   1.56   1. ... Nxc5 2. Qb4 Kg8 3. Rh3 Ng6 4.
                                    Rf3 Kg7 5. Rf6 Rd3 6. Rgf2 Nh8 7. Qh4
                                    Qxc3 (s=2)
               13     1:25     ++   1. ... Nf4!!
               13     3:31   1.15   1. ... Nf4 2. Rc2 Rxg1+ 3. Rxg1 Qe3
                                    4. Qb1 Qe4+ 5. Rcg2 Ned3 6. Qf1 Nxg2
                                    7. Rxg2 Nf4 8. c6 Nxg2 9. Qxg2
               13->   3:41   1.15   1. ... Nf4 2. Rc2 Rxg1+ 3. Rxg1 Qe3
                                    4. Qb1 Qe4+ 5. Rcg2 Ned3 6. Qf1 Nxg2
                                    7. Rxg2 Nf4 8. c6 Nxg2 9. Qxg2
               14     4:24   0.99   1. ... Nf4 2. Rc2 Rxg1+ 3. Rxg1 Qe3
                                    4. Qb1 Qe4+ 5. Rcg2 Ned3 6. Qf1 Nxg2
                                    7. Rxg2 Nf4 8. cxb6 axb6 9. Kg1 Nxg2
                                    10. Qxg2

>
>[D]8/p4pkp/1p6/2P1n1P1/5n2/1QP1q3/P1R4P/6RK w - -
>
>This is the game after Nf4 Rc2 Rxg1 Rxg1 Qe3.
>How long for your engine to show a draw score here?  Warp's score drops to +0.3
>at depth 12, in about 3.5 minutes.  I'll let it continue to see when it sees the
>draw.

My score is down to +.10 after a few seconds.  I get draw score at depth=14,
after 94
seconds.

               12    15.47   0.10   1. Qb1 Qe4+ 2. Rcg2 Ned3 3. Qf1 Nxg2
                                    4. Rxg2 Nf4 5. h3 Nxg2 6. Qxg2 Qe1+
                                    7. Qg1 Qxc3 8. cxb6 axb6 (s=3)
               14     2:33   0.00   1. Qb1 Qe4+ 2. Rcg2 Ned3 3. Qf1 Nxg2
                                    4. Rxg2 Nf4 5. cxb6 axb6 6. Kg1 Nh3+
                                    7. Kh1 Nf4

Those would be 50% faster on my xeon 700 box...


>
>thanks,
>Peter



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