Right Diagonal Problem

private boolean hasWonDiagonally(Player userCharacter) {
/*
        0 1 2
        3 4 5
        6 7 8  0 4 8 from left to right 2 4 6 from right to left
         */
        // if both increase at the same time we can check the LTR properly
        int leftToRightDiagonalCount = 0;
        int rightToLeftDiagonalCount = 0;
        for (int i = 0; i < COLS; i++) {
            int tileIndex = translateIndex(i, i);
            if (grid[tileIndex] == userCharacter) {
                leftToRightDiagonalCount++;
                if (leftToRightDiagonalCount == 3 ){
                    return true;
                }
            }
        }
        // row * 3 + col 0 * 3 + 2, 0 * 3 + 1
        for (int j = 0; j < ROWS; j++) { // from the max lowering to the minimal
            for (int i = COLS - 1; i >= 0; i--) {
                int tileIndex = translateIndex(j, i);
                if (grid[tileIndex] == userCharacter) {
                    rightToLeftDiagonalCount++;
                    if (rightToLeftDiagonalCount == 3 ){
                        return true;
                    }
                }
            }
        }
        return false;
    }