On the last hand (board 7) East might always hold up on the first diamond truck, regardless of what West plays on it. If the D9 is a singleton, West discarding on the second tound of diamonds would reveals South has another, do East must hold up again.
On the last hand (board 7) East might always hold up on the first diamond truck, regardless of what West plays on it. If the D9 is a singleton, West discarding on the second tound of diamonds would reveals South has another, do East must hold up again.