function displaySearchSpace()
    local s = buildSearchSpace(uiBoard[2])
    for x = 1, 9 do
        for y = 1, 9 do
            for z = 1, 9 do
                smallNumbersVal[x][y][z] = false
            end
            for _, v in ipairs(s[y][x]) do
                smallNumbersVal[x][y][v] = true
            end
        end
    end
    messages = scheck(uiBoard[2])
end

function checkBoard()
    messages = scheck(uiBoard[2])
end

function loadLastBoard()
    board = {}
    board[1], board[2] = loadBoard("lastBoard.txt")
    uiBoard[1] = cloneBoard(board[1])
    uiBoard[2] = cloneBoard(board[2])
    uiBoard[3] = cloneBoard(board[2])
    messages[1] = 'loaded: "lastBoard.txt"'
end

function saveCurrentBoard()
    local f = io.open("lastBoard.txt", "w")
    for row = 1, 9 do
        f:write(table.concat(uiBoard[1][row], " "))
        f:write("\n")
    end
    f:write("\n")
    for row = 1, 9 do
        f:write(table.concat(uiBoard[2][row], " "))
        f:write("\n")
    end
    f:close()
    messages[1] = 'saved: "lastBoard.txt"'
end