Shusaku number

A shusaku number is a special number in the game of Go. Go is a game where two players have to capture each other's pieces by surrounding them with their own pieces.

Shusaku was a very famous Go player from Japan who won a lot of games in the 19th century. Shusaku's number is a special position on the Go board where he made a really cool move that helped him win a very important game.

To remember the move, people started calling it the shusaku number. It's like a secret code for the move. Now, people try to recreate this move in their own games as a tribute to Shusaku.

So, a shusaku number is just a special position on the board that helps you make a really cool move like Shusaku did a long time ago.