Best-First Fixed-Depth Game-Tree Search in Practice - liacs

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our understanding of depth-first and best-first minimax .... using a relatively cheap table lookup. .... cation domains, the obvious approximation for the mini-.
Othello, Average over 20 Trees

Cumulative Leaves Relative to Asp NS (%)

110 108

depth 8 depth 9

106 104 102 100 98 96 94 -30

-20

-10 0 10 Difference of first guess from f

20

30

Chess - CPU time MTD(f) Relative to AspNS (%)

Chess - Leaves Relative to Aspiration NegaScout (%)

110

115

AspNS time/leaves MTD(f) time MTD(f) leaves

AspNS AB MTD(f) Dual* SSS*

110

105

105

100

100

95

95 90

90 85 3

4

5

6 Depth

85 2

3

4

5

6

7

8

9

Depth

Chess - All nodes Relative to Aspiration NegaScout (%) 160 150 140 AspNS AB MTD(f) Dual* SSS*

130 120 110 100 90 2

3

4

5

6 Depth

7

8

9

7

8