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Reversi lessons · Intermediate · Step 6
Growing Stable Discs
Discs connected without gaps from a corner along the edges can never be flipped again (stable discs). In the end, these are the discs that count when the board fills up, so once you have a corner, keep extending your stable discs from it.
Puzzle 1
Which move gives Black the most discs that can never be flipped? (Black to move)
Show answer and explanation
The yellow circle marks the answer. The answer raises Black's stable discs from 5 to 16. The biggest-flipping move stays at 5. A C-square is safe too when you already own the corner.
Puzzle 2
Find the square that connects to your corner and lock it down. (Black to move)
Show answer and explanation
The yellow circle marks the answer. The answer locks down the line connected to the corner, taking your stable discs from 5 to 16. The biggest-flipping move leaves you at 5.