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Reversi lessons · Basics · Step 2
Taking Corners
A disc in one of the four corners can't be trapped from any direction, so it can never be flipped. Taking a corner also lets you lock down the edges next to it one by one, which makes corners the most valuable squares in Reversi.
Puzzle 1
Resist the move that flips the most, and take the most valuable square. (Black to move)
Show answer and explanation
The yellow circle marks the answer. The biggest-flipping move flips 11 discs, but those discs can be flipped back. The corner flips only 1, but it's yours for good and gives you a foothold to secure the edges.
Puzzle 2
Same idea, different corner. (Black to move)
Show answer and explanation
The yellow circle marks the answer. One corner is worth more than a move that flips 8. Once you hold the corner, the discs next to it become stable one by one.