In Blunderrific, the object of the game is to guess in which scenario a blunder is about to be played. You are given two game scenarios (a board position, player ratings, and clock times) from real games, where it's always White to move, and in one of them White's next move was a blunder and in the other it wasn't. Using the board position, clock times, and player ratings, you have to guess which is which!



To keep things simple, a blunder is a move that changes the evaluation of a position for the worse for White. For example, if White was winning before, then making a move that turns the position into a draw or loss for White is a blunder. Similarly, if White was in a drawn position before the move but lost after the move, then the move is a blunder.



In every position you'll see, there is at least one blunder White can make.