Author: Omid David Tabibi
Date: 14:31:57 11/20/02
Go up one level in this thread
On November 20, 2002 at 16:55:41, Gian-Carlo Pascutto wrote: >Nullmove in Deep Sjeng uses an algorithm of my own, but I can >switch it back to other systems easily. I did so for running >a few tests. > >I made a version which uses Heinz Adaptive Nullmove Pruning >and a version which uses your verification nullmove. > >I did a run over ECM-GCP, at 10 seconds per position. > >giancarlo@garf:~/sjeng > ./compare3.pl 240 241 >Comparing 240 vs 241 >Pos: 1 | Bg4 | - | - | 9.6 | 9.0 | 10 | 9 | 6077427 | >5854404 >Pos: 2 | Nxg4 | Bb5 | Bb5 | 8.6 | 8.6 | 607 | 974 | 3261400 | >6097488 >Pos: 3 | Nd5 | - | - | 10.0 | 9.6 | 110 | 253 | 3937003 | >4249315 >Pos: 4 | Bxd5 | - | - | 10.6 | 9.6 | 113 | 103 | 6635622 | >4312132 >Pos: 5 | Rxc8 | Qxa3 | Rxd6 | 10.0 | 10.0 | 522 | 752 | 3438275 | >5570487 >Pos: 6 | Rxa1 | - | - | 10.0 | 9.6 | 298 | 261 | 4600660 | >4362616 >Pos: 7 | Nxc6 | Bf3 | Bf3 | 8.6 | 9.0 | 0 | 0 | 3282289 | >4955546 >Pos: 8 | d3 | - | - | 10.6 | 10.6 | 210 | 301 | 4525770 | >6204639 >Pos: 9 | Qxf7+ | - | - | 9.6 | 10.6 | 934 | 100 | 6514297 | >7121127 >Pos: 10 | Rxb2+ | - | - | 9.0 | 8.3 | 179 | 167 | 5321098 | >3294826 >Pos: 11 | Nxf7 | - | - | 9.6 | 9.0 | 66 | 90 | 5011237 | >6148378 >Pos: 12 | Rxd4 | Nh5 | Nh5 | 9.6 | 9.0 | 0 | 0 | 4255664 | >4621228 >Pos: 13 | g6 | - | - | 9.6 | 9.6 | 13 | 13 | 3619239 | >5454250 >Pos: 14 | Kg2 | Qh6 | Qh6 | 9.0 | 9.0 | 709 | 770 | 3639929 | >4113976 >Pos: 15 | Nh7 | - | - | 10.6 | 10.6 | 18 | 15 | 4676206 | >5788576 >Pos: 16 | Nxc5 | - | - | 8.6 | 8.3 | 758 | 895 | 5778234 | >5874884 >Pos: 17 | Rd4 | - | - | 10.0 | 9.6 | 117 | 146 | 5407879 | >4976856 >Pos: 18 | exf6 | - | - | 9.0 | 9.0 | 230 | 278 | 4226676 | >5089733 >Pos: 19 | Nh6+ | - | - | 9.6 | 9.0 | 222 | 246 | 5022900 | >4234842 >Pos: 20 | Re7 | - | - | 10.6 | 10.0 | 27 | 33 | 5345105 | >4663622 >Pos: 21 | Qxc3+ | - | - | 10.0 | 9.6 | 52 | 47 | 4410530 | >5960068 >Pos: 22 | Qxh3+ | - | - | 8.6 | 8.0 | 8 | 6 | 2921917 | >4206605 >Pos: 23 | Qxf5+ | - | - | 11.0 | 10.0 | 19 | 20 | 6491996 | >7303350 >Pos: 24 | Nxh7 | O-O | O-O | 9.0 | 9.0 | 876 | 743 | 5421985 | >4950831 >Pos: 25 | Rxf6 | - | - | 10.6 | 9.3 | 307 | 685 | 5385906 | >3588158 >Pos: 26 | Nf6+ | - | - | 9.0 | 8.3 | 17 | 17 | 4900798 | >4574982 >Pos: 27 | Nxh5 | - | - | 10.6 | 10.0 | 67 | 74 | 4237081 | >4807855 >Pos: 28 | Rxe7 | f4 | Re2 | 9.6 | 10.0 | 0 | 0 | 4226886 | >3927724 >Pos: 29 | Rxd5 | - | - | 7.6 | 7.6 | 2 | 2 | 2066506 | >2593429 >Pos: 30 | d3+ | Rf8 | Rf8 | 8.6 | 8.6 | 313 | 344 | 1758501 | >1930475 >Pos: 31 | Bd5+ | - | - | 10.0 | 9.0 | 58 | 64 | 5724868 | >4706264 >Pos: 32 | Ba3 | Ne2 | Ne2 | 10.0 | 9.6 | 0 | 0 | 3227035 | >4476823 >Pos: 33 | g6 | - | - | 9.0 | 8.3 | 427 | 596 | 4353643 | >5058109 >Pos: 34 | Ra8 | Rb8 | Rb8 | 9.6 | 9.6 | 753 | 772 | 4702685 | >5176154 >Pos: 35 | g4+ | - | - | 10.6 | 10.6 | 83 | 91 | 2943640 | >5467988 >Pos: 36 | Ba4 | - | - | 10.0 | 10.0 | 711 | 451 | 5497145 | >5758253 >Pos: 37 | Nxf7 | - | - | 8.6 | 8.6 | 5 | 5 | 3366684 | >4527366 >Pos: 38 | Nf2+ | - | - | 11.0 | 10.0 | 52 | 46 | 10037221 | >11187940 >Pos: 39 | Ne4 | - | - | 8.6 | 9.0 | 411 | 426 | 4560487 | >4305261 >Pos: 40 | Nb6 | - | Qf3 | 10.0 | 10.0 | 151 | 1000 | 2540391 | >5607155 >Pos: 41 | Bxc2 | - | - | 9.6 | 9.6 | 245 | 258 | 2621935 | >4644411 >Pos: 42 | Bxc5 | - | - | 10.6 | 10.6 | 35 | 34 | 4275866 | >5873212 >Pos: 43 | Rxd5 | - | - | 9.6 | 9.6 | 15 | 16 | 3982771 | >4616454 >Pos: 44 | Rb3 | - | - | 9.6 | 9.6 | 117 | 116 | 3276091 | >5396892 >Pos: 45 | Bf4 | - | - | 9.0 | 8.3 | 379 | 485 | 5342912 | >4745199 >Pos: 46 | Re7 | - | - | 9.0 | 8.3 | 122 | 132 | 4962305 | >1752502 >Pos: 47 | Nxe3 | - | - | 8.6 | 8.6 | 33 | 34 | 1103855 | >2143169 >Pos: 48 | Ra2+ | - | - | 8.0 | 8.3 | 193 | 177 | 2844140 | >4453366 >Pos: 49 | Bg7 | - | - | 9.0 | 9.0 | 13 | 13 | 3384906 | >4291700 >Pos: 50 | Qc1 | - | - | 9.6 | 9.6 | 131 | 140 | 2149000 | >2442977 >Pos: 51 | Rxc5 | - | - | 9.6 | 9.6 | 262 | 200 | 4082180 | >5498740 >Pos: 52 | Rxd6 | - | - | 10.6 | 9.6 | 27 | 29 | 4354735 | >3509118 >Pos: 53 | Rh4+ | Rg4 | Qh5+ | 8.6 | 7.6 | 0 | 0 | 5629324 | >5993724 >Pos: 54 | Bh7+ | Qb3 | Qb1 | 9.0 | 9.6 | 0 | 0 | 4824788 | >5501309 >Pos: 55 | Bxf7+ | - | - | 8.0 | 7.3 | 66 | 78 | 5229564 | >3288573 >Pos: 56 | Bb7 | - | - | 11.0 | 10.0 | 6 | 8 | 5548401 | >4394668 >Pos: 57 | Rxd7 | Rxd7+ | Rxd7+ | 9.0 | 9.0 | 592 | 740 | 3170022 | >4084424 >Pos: 58 | Bxh6 | - | - | 10.6 | 9.6 | 24 | 146 | 4597345 | >4302558 >Pos: 59 | Rxh8+ | - | - | 9.0 | 8.3 | 76 | 246 | 3395839 | >1316383 >Pos: 60 | Bh7+ | - | - | 9.6 | 9.0 | 27 | 26 | 4733505 | >4606647 >Pos: 61 | Nxf7 | - | - | 9.6 | 9.6 | 98 | 142 | 3070161 | >3799728 >Pos: 62 | Bg3+ | - | - | 9.6 | 9.0 | 351 | 149 | 6053895 | >5138173 >Pos: 63 | Rb1+ | - | - | 12.0 | 11.0 | 24 | 26 | 11787829 | >9532525 >Pos: 64 | Rxc3 | - | - | 8.6 | 8.0 | 5 | 4 | 4024352 | >3401443 >Pos: 65 | Nxg7 | - | - | 9.0 | 9.3 | 217 | 814 | 5388306 | >5498831 >Pos: 66 | Bxg6+ | - | - | 9.0 | 9.0 | 62 | 35 | 4363706 | >4596788 >Pos: 67 | Qh6+ | Qd2 | Qd2 | 8.6 | 8.0 | 0 | 0 | 4744042 | >5250455 >Pos: 68 | Nxg7 | Nxe7+ | Nxe7+ | 9.6 | 9.0 | 0 | 0 | 5046980 | >4140334 >Pos: 69 | Rxb2 | Be5 | Rb4 | 9.0 | 9.0 | 675 | 862 | 3278810 | >4422394 >Pos: 70 | Qxg6+ | - | - | 10.6 | 9.6 | 13 | 13 | 10541368 | >9760632 >Pos: 71 | e4 | - | - | 7.6 | 7.3 | 261 | 358 | 4537465 | >2034713 >Pos: 72 | Re7 | - | - | 9.6 | 9.0 | 32 | 45 | 5576040 | >5132876 >Pos: 73 | R1b4 | - | - | 9.6 | 9.0 | 197 | 190 | 5874608 | >6237045 >Pos: 74 | Re4 | - | - | 10.6 | 10.0 | 47 | 34 | 5267152 | >3315835 >Pos: 75 | Nd5 | - | - | 8.6 | 8.6 | 38 | 54 | 4058409 | >5236853 >Pos: 76 | Rxe7 | - | - | 10.0 | 8.3 | 3 | 4 | 5664769 | >6006027 >Pos: 77 | Rxd7 | Bd2 | Bd2 | 9.0 | 9.0 | 757 | 537 | 3411782 | >2685151 >Pos: 78 | Qh6 | - | - | 11.6 | 11.6 | 27 | 79 | 4639870 | >7283884 >Pos: 79 | Rxe6 | - | - | 11.0 | 10.6 | 155 | 137 | 5358500 | >4752928 >Pos: 80 | Rxc8+ | Rc6 | Rc6 | 8.6 | 8.0 | 0 | 0 | 5528855 | >3992712 >Pos: 81 | Rxe4 | - | - | 9.6 | 9.6 | 8 | 11 | 3624257 | >4950719 >Pos: 82 | Rxd4 | Bxe5 | Bxe5 | 11.0 | 10.6 | 0 | 0 | 5716052 | >4861479 >Pos: 83 | Rxe5 | cxd5 | cxd5 | 8.6 | 8.6 | 496 | 585 | 2298605 | >3147240 >Pos: 84 | Rxc5 | - | - | 11.0 | 10.6 | 101 | 381 | 6354130 | >7246151 >Pos: 85 | Rxe7 | Qh6 | Qh6 | 8.6 | 8.6 | 625 | 646 | 3132419 | >3685817 >Pos: 86 | Nxe6 | Qf3 | Qf3 | 9.6 | 9.6 | 786 | 680 | 4367004 | >4204082 >Pos: 87 | Rxe3 | - | - | 10.6 | 9.6 | 4 | 4 | 5138871 | >3193802 >Pos: 88 | Rxd7 | - | - | 10.0 | 9.3 | 393 | 527 | 3915536 | >3892878 >Pos: 89 | Rxc1 | Rc5 | - | 10.0 | 9.6 | 1000 | 643 | 5032185 | >4521420 >Pos: 90 | Rxd4 | Be3 | Be3 | 10.0 | 10.0 | 879 | 935 | 4970703 | >5330804 >Pos: 91 | Rxd8 | Qe3 | h3 | 9.0 | 9.0 | 511 | 611 | 2871068 | >3325591 >Pos: 92 | Rxg6+ | - | - | 10.6 | 10.0 | 264 | 95 | 4942753 | >4938838 >Pos: 93 | Bd8 | Bd2 | Rf2 | 8.6 | 8.3 | 0 | 0 | 4865999 | >4780042 >Pos: 94 | Bh2 | O-O-O | O-O-O | 8.6 | 9.0 | 0 | 0 | 1772729 | >2776425 >Pos: 95 | Bxe5+ | Be2 | Be2 | 11.0 | 10.0 | 0 | 0 | 6398331 | >4423433 >Pos: 96 | Bc3 | - | - | 10.6 | 10.0 | 61 | 87 | 5290073 | >4972909 >Pos: 97 | Rxc4 | Rc1 | Rc1 | 9.0 | 9.0 | 549 | 710 | 3210360 | >4335553 >Pos: 98 | d4 | - | - | 9.6 | 9.6 | 104 | 81 | 4497801 | >4718851 >Pos: 99 | Nf6+ | - | - | 9.6 | 8.6 | 63 | 85 | 4298969 | >3406295 >Pos: 100 | Rxe3 | - | - | 10.6 | 9.6 | 78 | 53 | 4868562 | >3773399 >Pos: 101 | Rxa6 | Ng5 | Ng5 | 10.0 | 9.6 | 0 | 0 | 4388876 | >4132292 >Pos: 102 | Rhg8 | - | Qxa2 | 9.6 | 9.6 | 222 | 1000 | 3616017 | >3650119 >Pos: 103 | Rxd3 | - | - | 9.0 | 9.0 | 179 | 226 | 3741093 | >5658021 >Pos: 104 | e5 | - | Qb2 | 10.3 | 10.0 | 965 | 1000 | 6088236 | >5379540 >Pos: 105 | Rxh5 | - | - | 8.6 | 9.0 | 24 | 68 | 2356619 | >4698216 >Pos: 106 | Nxe5 | d4 | Kh1 | 10.0 | 10.0 | 833 | 856 | 4989337 | >4295382 >Pos: 107 | Rxc4 | - | - | 11.6 | 10.6 | 99 | 236 | 5687878 | >5521472 >Pos: 108 | Rxf6 | - | - | 8.6 | 8.6 | 45 | 43 | 2759174 | >2965453 >Pos: 109 | e6 | - | - | 7.6 | 7.6 | 158 | 158 | 2048097 | >2608366 >Pos: 110 | Bd2 | Bg5 | Bg5 | 9.6 | 9.6 | 724 | 893 | 4016174 | >5128796 >Pos: 111 | Nxe4 | - | - | 9.6 | 9.3 | 209 | 764 | 4497980 | >4184511 >Pos: 112 | Ng5 | - | - | 8.6 | 8.6 | 351 | 123 | 2180358 | >3535476 >Pos: 113 | bxc6 | - | - | 9.0 | 9.0 | 76 | 86 | 5071942 | >4964637 >Pos: 114 | Rxf6 | - | - | 10.3 | 10.0 | 439 | 88 | 2618951 | >3557999 >Pos: 115 | Bxh6 | - | - | 10.0 | 9.6 | 49 | 87 | 4796785 | >3454241 >Pos: 116 | Bh4 | Bd5 | Bd5 | 9.0 | 8.6 | 0 | 0 | 3914415 | >2527820 >Pos: 117 | Bf8 | Kb1 | Kb1 | 9.0 | 9.0 | 272 | 364 | 1298119 | >1804183 >Pos: 118 | Ng6+ | - | - | 9.6 | 9.6 | 98 | 120 | 3788493 | >6213735 >Pos: 119 | Qb2 | Qf3 | Rf3 | 9.0 | 9.0 | 806 | 841 | 4112386 | >4709754 >Pos: 120 | Qxg5+ | - | - | 10.6 | 9.6 | 102 | 361 | 3153891 | >3670819 >Pos: 121 | Rxh2+ | - | - | 13.6 | 13.0 | 22 | 22 | 6304711 | >13168553 >Pos: 122 | h4 | - | - | 8.6 | 8.6 | 337 | 400 | 3337879 | >3545807 >Pos: 123 | Bxh5 | - | - | 10.6 | 9.6 | 169 | 665 | 4628368 | >3837163 >Pos: 124 | Rxd5 | Bg2 | Bg2 | 9.0 | 9.3 | 0 | 0 | 2820742 | >5386479 >Pos: 125 | Rf6 | Rf5 | - | 10.0 | 9.6 | 1000 | 1 | 4742150 | >4130608 >Pos: 126 | Nc3+ | Ke8 | - | 9.0 | 8.6 | 1000 | 35 | 3434579 | >2950131 >Pos: 127 | Nxf5+ | - | - | 9.0 | 8.3 | 193 | 252 | 4840098 | >3771390 >Pos: 128 | Ne6 | - | - | 9.6 | 9.6 | 19 | 1 | 3607277 | >4119862 >Pos: 129 | Nxh6 | - | - | 9.6 | 9.6 | 16 | 14 | 3443946 | >4462823 >Pos: 130 | Bg5 | Ne3 | Ne3 | 10.0 | 9.6 | 0 | 0 | 5177733 | >3911402 >Pos: 131 | Bh3 | axb5 | axb5 | 8.6 | 8.6 | 537 | 565 | 2411959 | >2865414 >Pos: 132 | Nd6 | - | - | 10.0 | 10.0 | 45 | 35 | 2698967 | >2337648 >Pos: 133 | Nxf4 | - | - | 9.6 | 9.0 | 196 | 68 | 2982217 | >2956597 >Pos: 134 | f3 | Rf7 | Qf6 | 8.0 | 8.0 | 580 | 435 | 2781573 | >2313360 >Pos: 135 | Nxf3 | Rf7 | Rf7 | 9.0 | 9.0 | 304 | 257 | 1474063 | >1342188 >Pos: 136 | Rxe6 | - | - | 10.6 | 10.0 | 75 | 105 | 5104159 | >4986142 >Pos: 137 | Nxf5 | - | - | 8.6 | 8.6 | 547 | 575 | 4619606 | >5139605 >Pos: 138 | Rxf4+ | - | - | 9.6 | 8.6 | 100 | 109 | 4469998 | >3281839 >Pos: 139 | Bxf6 | - | - | 10.6 | 10.0 | 175 | 222 | 6536642 | >6755401 >Pos: 140 | Nf3+ | - | - | 8.6 | 9.0 | 638 | 433 | 3627580 | >4533224 >Pos: 141 | Nf5+ | - | - | 9.6 | 9.0 | 65 | 61 | 3518819 | >4520289 >Pos: 142 | Bxh4 | - | - | 9.0 | 9.0 | 388 | 455 | 4171656 | >3376410 >Pos: 143 | Nxf7 | - | - | 8.6 | 8.6 | 616 | 536 | 3474168 | >4272427 >Pos: 144 | Rxc5 | Ne5 | Ne5 | 10.6 | 10.6 | 528 | 716 | 3054497 | >4254222 >Pos: 145 | Bh3 | - | - | 10.6 | 10.0 | 112 | 142 | 5161728 | >4028931 >Pos: 146 | Nxc6 | - | - | 10.6 | 10.6 | 587 | 495 | 3763154 | >4597121 >Pos: 147 | h3 | Be3 | Be3 | 9.0 | 9.0 | 794 | 891 | 4220587 | >4976541 >Pos: 148 | Be6 | - | - | 10.0 | 10.6 | 23 | 25 | 2618110 | >5680184 >Pos: 149 | Nxh2 | Qg5 | Bf5 | 9.6 | 9.0 | 0 | 0 | 5377920 | >2635147 >Pos: 150 | f4 | - | - | 12.0 | 12.0 | 130 | 130 | 5592310 | >5428767 >Pos: 151 | Rxc6 | - | Rd6 | 13.3 | 13.3 | 528 | 1000 | 3834208 | >3059267 >Pos: 152 | f6 | - | - | 8.6 | 8.6 | 202 | 235 | 3204718 | >4677819 >Pos: 153 | e5 | Ba6 | Ba6 | 10.6 | 9.6 | 0 | 0 | 4802799 | >3248246 >Pos: 154 | b5 | - | Qf4 | 9.6 | 9.6 | 624 | 1000 | 6965856 | >5346725 >Pos: 155 | Rxa6 | - | - | 10.6 | 9.6 | 657 | 789 | 5407643 | >5346630 >Pos: 156 | Rc4 | - | - | 13.6 | 12.0 | 432 | 659 | 7487082 | >5671496 >Pos: 157 | Nxe6 | - | - | 11.6 | 11.0 | 9 | 13 | 4548799 | >5596912 >Pos: 158 | Ba6 | - | Kf3 | 9.6 | 10.0 | 99 | 1000 | 5539155 | >4959716 >Pos: 159 | Nxa7 | Rfe1 | Bf4 | 9.6 | 9.6 | 492 | 268 | 2897038 | >1822645 >Pos: 160 | Rxb2 | c3 | c3 | 13.0 | 11.6 | 0 | 0 | 5964974 | >5060726 >Pos: 161 | cxb6 | - | - | 11.6 | 11.6 | 80 | 105 | 5350193 | >6474694 >Pos: 162 | f5 | Rxe8+ | Rxe8+ | 11.6 | 10.6 | 0 | 0 | 6109265 | >5605217 >Pos: 163 | Bxb3 | c4 | c4 | 13.0 | 13.0 | 577 | 569 | 2893519 | >3875034 >Pos: 164 | Bxh7+ | - | - | 9.6 | 9.0 | 41 | 32 | 6332861 | >4512055 >Pos: 165 | Bxh7+ | e6 | e6 | 9.0 | 8.6 | 0 | 0 | 4859339 | >3653444 >Pos: 166 | Bxh7+ | - | - | 9.6 | 8.6 | 28 | 30 | 3303891 | >1425061 >Pos: 167 | Bxh7+ | - | - | 9.6 | 9.0 | 238 | 345 | 6846323 | >5489967 >Pos: 168 | Rxh7+ | - | - | 9.0 | 8.6 | 176 | 171 | 4850390 | >3566893 >Pos: 169 | Rxh7 | - | - | 10.0 | 10.3 | 85 | 900 | 4214401 | >4143596 >Pos: 170 | Bxh7+ | - | - | 9.6 | 8.6 | 54 | 54 | 6450279 | >4778717 >Pos: 171 | Nxh7 | Ng4 | Ng4 | 9.6 | 9.6 | 960 | 708 | 4352144 | >4042034 >Pos: 172 | Nxh2 | - | - | 9.0 | 9.0 | 200 | 205 | 4685585 | >5393321 >Pos: 173 | Bxh7+ | - | - | 8.6 | 8.6 | 71 | 145 | 2870316 | >4785799 >Pos: 174 | Qxh7+ | - | - | 12.6 | 11.0 | 67 | 82 | 12637945 | >10455002 >Pos: 175 | Bxh7+ | - | - | 7.6 | 7.6 | 347 | 312 | 4315370 | >3869957 >Pos: 176 | Nxh7 | Bxe6 | Bxe6 | 9.6 | 9.3 | 0 | 0 | 5229866 | >4912906 >Pos: 177 | Rxh7 | - | - | 9.6 | 9.6 | 77 | 183 | 3600114 | >3629262 >Pos: 178 | Nxh7 | e6 | e6 | 10.0 | 9.0 | 0 | 0 | 4807546 | >3450169 >Pos: 179 | Bxh7+ | Bh3 | Bg4 | 10.0 | 9.6 | 0 | 0 | 4677874 | >3538094 >Pos: 180 | Bxh7+ | - | - | 9.0 | 9.0 | 201 | 11 | 2818734 | >2670067 >Pos: 181 | Rxh2 | Nxg4 | Qb8 | 10.0 | 9.6 | 0 | 0 | 3351722 | >4534124 >Pos: 182 | Nxh7 | Bd2 | Bd2 | 10.6 | 10.6 | 618 | 591 | 3581004 | >3927991 >Pos: 183 | Rxh7 | - | - | 9.6 | 9.6 | 92 | 341 | 3023799 | >5486345 > >Warning: node count is different! > >Node count is for same depth only. > > Old New Ratio >----------------------------------------------------- >Nodes: 276192044 332673312 120.45% >Time: 42505 47998 112.92% >Depth: 9.73 9.41 -0.32 >Solved: 126 123 > >So, you can see here that verification nullmove searches 20% more >nodes, took 12% more time, searched 1/3 of a ply less deep and >missed three more positions. > >That's pretty much a 'total loss' :) > That is a typical result when the quiescence search is too big. With the help of its extensions, even the standard version of your algorithm manages to detect most of the problems that verified null-move is meant to detect. So the verification search is just a waste of time in this case (and since your test was conducted in a fixed time per position, this waste of time didn't enable the verified version to reach deeper and detect what the other version did). Solution: By shifting to a far simpler quiescence search, you will get about the same tactical strength as you get currently (since this time, verified null-move will detect the problems, instead of your immense quiescence), but will end up with a significantly smaller search tree. The quiescence search of Genesis which I conducted the tests on, consisted of only captures/recaptures. >-- >GCP
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