There are 5 black and 5 white Go pieces mixed in a bag, and they are exactly the same in size and shape. If you don't need to look at it with your eyes, you must touch at least how many pieces of chess pieces of two different colors at one time.
一只袋里混合放着黑、白围棋子各5颗，他们的大小形状完全相同．如果不用眼睛看，要保证一次摸出两种不同颜色的棋子，至少要摸多少颗棋子．
<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<result>6</result>