Uncaught TypeError: this.cbView.boardLayout[((NBROWS - row) - 1)] is undefined
This sounds like an out-of-bounds access on boardLayout. Are you sure you defined that array with sufficiently many ranks? To further diagnose the problem you could add console.log(NBROWS-row-1); just before the access to boardLayout in paintCells; then you could see in the console what the offending value is.
This sounds like an out-of-bounds access on boardLayout. Are you sure you defined that array with sufficiently many ranks? To further diagnose the problem you could add console.log(NBROWS-row-1); just before the access to boardLayout in paintCells; then you could see in the console what the offending value is.