Knight tour

function load()
    term.clear()

    moves = 0

    x = math.random(1, 15);
    y = math.random(1, 15);

    tPlayer = {
        x = x;
        y = y;
    }

    tDone = {(x+10)..":"..(y+2)}
end

function getVals( sVals )
    sep = string.find(sVals, ":")
    x = tonumber(string.sub(sVals, 1, (sep-1)))
    y = tonumber(string.sub(sVals, (sep+1), #sVals))
    return x, y
end

function drawBoard()
    for i = 3, 17 do
        term.setBackgroundColor(colors.brown)
        term.setCursorPos(11, i)
        term.write("                ")
    end
end

function drawDone()
    for k, v in pairs(tDone) do
        x, y = getVals(v)
        term.setCursorPos(x, y)
        term.setBackgroundColor(colors.red)
        term.write(" ")
    end
end

function drawPlayer()
    term.setCursorPos(10 + tPlayer.x, 2 + tPlayer.y)
    term.setBackgroundColor(colors.white)
    term.write(" ")
end

function drawPossible()
    tPossible = {}

    x = tPlayer.x + 10 + 2
    y = tPlayer.y + 2 + 1

    tPossible[1] = x..":"..y

    term.setCursorPos(x, y)
    term.setBackgroundColor(colors.lime)
    term.write(" ")

----------------------------------

    x = tPlayer.x + 10 - 2
    y = tPlayer.y + 2 + 1

    tPossible[2] = x..":"..y

    term.setCursorPos(x, y)
    term.setBackgroundColor(colors.lime)
    term.write(" ")

----------------------------------

    x = tPlayer.x + 10 + 2
    y = tPlayer.y + 2 - 1

    tPossible[3] = x..":"..y

    term.setCursorPos(x, y)
    term.setBackgroundColor(colors.lime)
    term.write(" ")
-----------------------------------
    x = tPlayer.x + 10 - 2
    y = tPlayer.y + 2 - 1

    tPossible[4] = x..":"..y

    term.setCursorPos(x, y)
    term.setBackgroundColor(colors.lime)
    term.write(" ")

--=================================================
--=================================================

    x = tPlayer.x + 10 + 1
    y = tPlayer.y + 2 + 2

    tPossible[5] = x..":"..y

    term.setCursorPos(x, y)
    term.setBackgroundColor(colors.lime)
    term.write(" ")
------------------------------------------------
    x = tPlayer.x + 10 - 1
    y = tPlayer.y + 2 + 2

    tPossible[6] = x..":"..y

    term.setCursorPos(x, y)
    term.setBackgroundColor(colors.lime)
    term.write(" ")
---------------------------------------------
    x = tPlayer.x + 10 + 1
    y = tPlayer.y + 2 - 2

    tPossible[7] = x..":"..y

    term.setCursorPos(x, y)
    term.setBackgroundColor(colors.lime)
    term.write(" ")
--------------------------------------------
    x = tPlayer.x + 10 - 1
    y = tPlayer.y + 2 - 2

    tPossible[8] = x..":"..y

    term.setCursorPos(x, y)
    term.setBackgroundColor(colors.lime)
    term.write(" ")
end

function drawMoves()
    term.setCursorPos(1,1)
    term.write("Moves: "..moves)
end

function drawBorder()
    term.setBackgroundColor(colors.black)
    term.setCursorPos(9, 1)
    term.write("                     ")
    term.setCursorPos(9, 2)
    term.write("                     ")
    for i = 0, 16 do
        term.setCursorPos(8, i + 3)
        term.write("   ")
        term.setCursorPos(27, i + 3)
        term.write("   ")
    end

    term.setCursorPos(9, 18)
    term.write("                   ")
    term.setCursorPos(9, 19)
    term.write("                   ")
end

load()

while true do

    drawBoard()


    drawPossible()
    drawDone(tDone)
    drawPlayer()
    drawBorder()
    drawMoves()

    local event, button, xPos, yPos = os.pullEvent("mouse_click")
    step = true
    inBoard = true
    if xPos > 10 and xPos < 27 and yPos >= 3 and yPos < 18 then
        inBoard = true
    else
        inBoard = false
    end
    for key, val in pairs(tDone) do
        dx, dy = getVals(val)
        if (xPos-10) == dx-10 and (yPos-2) == dy-2 then
            step = false
        end
    end

    for k, v in pairs(tPossible) do
    x, y = getVals(v)
        if xPos == x and yPos == y and step and inBoard then

                moves = moves + 1
                tDone[#tDone+1] = x..":"..y
                tPlayer.x = x - 10
                tPlayer.y = y - 2

        end
    end
end