Thanks to www.samizdat.com for the information.
1 — Starting position. 32 pieces, 1 hole.
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X X X X X X X
X X X O X X X
X X X X X X X
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2 — 31 pieces, 2 holes.
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X X X X X X X
X X X X O O X
X X X X X X X
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3 — 30 pieces, 3 holes.
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X X X X X X X
X X X X X O X
X X X X O X X
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4. — 29 pieces, 4 holes
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