1 files changed, 0 insertions, 117 deletions
diff --git a/doc/play/solitaire.go b/doc/play/solitaire.go
deleted file mode 100644
index 15022aa194..0000000000
--- a/doc/play/solitaire.go
+++ /dev/null
@@ -1,117 +0,0 @@
-// This program solves the (English) peg
-// solitaire board game.
-// http://en.wikipedia.org/wiki/Peg_solitaire
-
-package main
-
-import "fmt"
-
-const N = 11 + 1 // length of a row (+1 for \n)
-
-// The board must be surrounded by 2 illegal
-// fields in each direction so that move()
-// doesn't need to check the board boundaries.
-// Periods represent illegal fields,
-// ● are pegs, and ○ are holes.
-
-var board = []rune(
-	`...........
-...........
-....●●●....
-....●●●....
-..●●●●●●●..
-..●●●○●●●..
-..●●●●●●●..
-....●●●....
-....●●●....
-...........
-...........
-`)
-
-// center is the position of the center hole if
-// there is a single one; otherwise it is -1.
-var center int
-
-func init() {
-	n := 0
-	for pos, field := range board {
-		if field == '○' {
-			center = pos
-			n++
-		}
-	}
-	if n != 1 {
-		center = -1 // no single hole
-	}
-}
-
-var moves int // number of times move is called
-
-// move tests if there is a peg at position pos that
-// can jump over another peg in direction dir. If the
-// move is valid, it is executed and move returns true.
-// Otherwise, move returns false.
-func move(pos, dir int) bool {
-	moves++
-	if board[pos] == '●' && board[pos+dir] == '●' && board[pos+2*dir] == '○' {
-		board[pos] = '○'
-		board[pos+dir] = '○'
-		board[pos+2*dir] = '●'
-		return true
-	}
-	return false
-}
-
-// unmove reverts a previously executed valid move.
-func unmove(pos, dir int) {
-	board[pos] = '●'
-	board[pos+dir] = '●'
-	board[pos+2*dir] = '○'
-}
-
-// solve tries to find a sequence of moves such that
-// there is only one peg left at the end; if center is
-// >= 0, that last peg must be in the center position.
-// If a solution is found, solve prints the board after
-// each move in a backward fashion (i.e., the last
-// board position is printed first, all the way back to
-// the starting board position).
-func solve() bool {
-	var last, n int
-	for pos, field := range board {
-		// try each board position
-		if field == '●' {
-			// found a peg
-			for _, dir := range [...]int{-1, -N, +1, +N} {
-				// try each direction
-				if move(pos, dir) {
-					// a valid move was found and executed,
-					// see if this new board has a solution
-					if solve() {
-						unmove(pos, dir)
-						fmt.Println(string(board))
-						return true
-					}
-					unmove(pos, dir)
-				}
-			}
-			last = pos
-			n++
-		}
-	}
-	// tried each possible move
-	if n == 1 && (center < 0 || last == center) {
-		// there's only one peg left
-		fmt.Println(string(board))
-		return true
-	}
-	// no solution found for this board
-	return false
-}
-
-func main() {
-	if !solve() {
-		fmt.Println("no solution found")
-	}
-	fmt.Println(moves, "moves tried")
-}