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Results for generated data

The results of this method, shown in Table 3, are reasonable and again seem to match those which Jansen et al. have established [17][18]. The attribute weights are all approximately what they should be. It can be seen from the amount of compression, that these $\lambda $ values are producing games which are very close to that of the original and the prediction of a game must be very high. The prediction rate will almost never be perfect; this is due to the random probabilistic approach that has been taken. The data is probabilistic, because when given a set of choices, a person will not necessarily make the same choice every time and this is especially true in the game of chess.


 
Table 3: Inference results from self playing using the advanced model.
  No.              
Colour Moves $\lambda_{MAT}$ $\lambda_{MOB}$ $\lambda_{CENT}$ $\lambda_{ATT}$ I-Random I-Inferred Comp (%)
White 74 7.697 0.151 0.499 2.000 120.061 57.205 $47.6\%$
Black 74 7.071 0.339 0.641 3.655 130.271 63.276 $48.6\%$
White 171 9.579 0.179 0.614 3.072 193.409 128.72 $66.6\%$
Black 171 6.905 0.205 0.532 2.810 215.413 132.959 $61.7\%$
White 94 7.924 0.126 0.331 2.954 83.9757 48.662 $57.9\%$
Black 94 6.210 0.218 0.604 2.374 121.842 65.955 $54.1\%$
White 42 6.353 0.216 1.264 2.526 305.108 114.409 $37.5\%$
Black 42 8.001 0.501 1.155 5.370 190.632 22.861 $12.0\%$
White 62 7.170 0.296 -0.915 2.767 107.598 76.778 $48.3\%$
Black 62 5.200 0.084 1.321 3.358 147.366 51.9442 $35.3\%$
W & B 5 Games 6.802 0.199 0.462 2.923 1067.49 1720.6 62.0$\%$
Actual Values 7.0 0.2 0.5 3.0      

Notice that larger numbers of moves result in $\lambda $ values that more accurately approximate those of the actual ones. The fact is it can be concluded that more information makes a Maximum Likelihood inference more accurate.


next up previous contents
Next: Chessmaster games Up: The minimum one ply Previous: Likelihood function
Richard A O Wallbrink
2000-11-07