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Subject: Re: Threat Extension and Tree Explosion

Author: Scott Gasch

Date: 19:50:02 05/23/02

Go up one level in this thread


Testing in the position from "Bullet game" thread to depth 11:

    r4rk1/4bpp1/1n2p2p/pqp2P2/R2pP3/1P1P2N1/2P1Q1PP/2B2RK1 w - - 0 19

Normal version (3/4 ply threat extension):

11.   +0.65  00:01:43.81  20756136     PV= 1. Qg4 Kh7 2. Ra1 Qc6 3. Nh5 g6
                                        > [threat] 4. f6 Bd6 5. Ng7 a4 6.
                                        > Qh4 <+0.00>

TREE: nodes: 20756136 (92.07% first move betas)
  TYPE termin:  35398     front: 8696882   qnode: 6828653   std.pat: 7198630
  CUTS nullmv:  2330030   recogn: 0        beta: 1005299    1stmv: 925612
         hash: 1423928    extfut: 2370973  razor: 4537
        q.fut: 3845153    q.see: 8792149

EXTEN: total: 341592
  TYPE check:   423690    threat: 7231     pawn: 0          recap: 70377
      !check:   229557    1reply: 67256    mult: 0          trans: 0
        s.ex:   2595      zug:    0

103.8 seconds @ 199910.0 nps.

----------

Version with threat extension = one full ply:

11.   +0.69  00:02:04.25  24929942     PV= 1. Qg4 Kh7 2. Ra1 Qc6 3. Nh5 Rg8
                                        > [threat] 4. f6 Bxf6 5. Nxf6+ gxf6
                                        > [recap] 6. Qh4 Rg6 [threat] 7.
                                        > Rxf6 Rxf6 8. Qxf6 [Q] <+0.00>

TREE: nodes: 24929942 (91.73% first move betas)
  TYPE termin:  65723     front: 10871702   qnode: 8117671   std.pat: 8969151
  CUTS nullmv:  2778697   recogn: 0        beta: 1312552    1stmv: 1203992
         hash: 1224205    extfut: 3312255  razor: 6302
        q.fut: 4680716    q.see: 10391834

EXTEN: total: 492163
  TYPE check:   620416    threat: 9910     pawn: 0          recap: 85650
      !check:   326871    1reply: 98288    mult: 0          trans: 0
        s.ex:   4770      zug:    0

124.3 seconds @ 200610.6 nps.

Scott



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