配列を使えばよいのでは?
Python
1import numpy as np
2
3board = np.arange(12*12, dtype=int).reshape(12,12)
4print('board:')
5print(board)
6
7slice = np.zeros((4,4,3,3), dtype=int)
8for i in range(0,4):
9 for j in range(0, 4):
10 slice[i][j] = board[i*3:(i+1)*3, j*3:(j+1)*3]
11
12print('\nslice[0,0]:')
13print(slice[0,0])
14print('\nslice[0,1]:')
15print(slice[0,1])
実行結果
board:
[[ 0 1 2 3 4 5 6 7 8 9 10 11]
[ 12 13 14 15 16 17 18 19 20 21 22 23]
[ 24 25 26 27 28 29 30 31 32 33 34 35]
[ 36 37 38 39 40 41 42 43 44 45 46 47]
[ 48 49 50 51 52 53 54 55 56 57 58 59]
[ 60 61 62 63 64 65 66 67 68 69 70 71]
[ 72 73 74 75 76 77 78 79 80 81 82 83]
[ 84 85 86 87 88 89 90 91 92 93 94 95]
[ 96 97 98 99 100 101 102 103 104 105 106 107]
[108 109 110 111 112 113 114 115 116 117 118 119]
[120 121 122 123 124 125 126 127 128 129 130 131]
[132 133 134 135 136 137 138 139 140 141 142 143]]
slice[0,0]:
[[ 0 1 2]
[12 13 14]
[24 25 26]]
slice[0,1]:
[[ 3 4 5]
[15 16 17]
[27 28 29]]