The following lists some results done by a C++ program that calculates the Sprague-Grundy function for three-rowed and four-rowed positions whose number of squares in each row is up to 500. The result suggests the similar behavior as described in the article The Sprague-Grundy Function for Chomp: When the top rows are fixed, the differences of the values of the Sprague-Grundy function and the number of squares in the first row is periodic.

In the following table, [A, B, C, D] represent a Chomp position with A, B, C being the fixed top rows, Period is the suggested period of the differences of the Sprague-Grundy function and the number of squares in the first row. Irr is the last occurrence of irregularity in D.

A B C Period Irr   1 0 4     1 1 4 7   1 2 2 2   1 3 12 12   1 4 24 12   1 5 24 38   1 6 48 39   1 7 96 81   1 8 96 105   1 9 96 203   1 10 96 214   1 11 96 287   1 12 96 274   1 13 96 284   2 0 12 7   2 1 4 14   2 2 6 12   2 3 24 14   2 4 24 63   2 5 48 59   2 6 96 129   2 7 96 148   2 8 96 227   2 9 96 257   2 10 96 289   2 11 96 316¤   2 12 96 361¤   3 0 6 26   3 1 12 29   3 2 12 26   3 3 24 84   3 3 24 84   3 4 48 150   3 5 192 192¤   3 6 192 244¤   4 0 36 34   4 1 72 35   4 2 72 58   4 3 144 209¤   5 0 72 94   5 1 72 95   5 2 72 66   6 0 72 187   6 1 144 211¤ 1 0 0 4   1 0 1 4 8 1 0 2 4 10 1 0 3 24 12 1 0 4 48 26 1 0 5 48 47 1 0 6 48 44 1 1 0 2 8 1 1 1 12 17 1 1 2 24 13 1 1 3 48 31 1 1 4 48 69¤ 1 2 0 12 32 1 2 1 24 32 1 2 2 48 24 2 0 0 4 7 2 0 1 12 26  2 0 2 24 26 2 0 3 48 49¤ 2 1 0 12 37 2 1 1 24 87 3 0 0 12 39 3 0 1 24 87 ¤ Although there is not enough result to validate a full period, there is still evidence to support it.