You're down a few pieces but up on time and decide to run out the clock. Your opponent times out, but you get a draw instead of a win. This happens due to Insufficient Mating Material.
What is Insufficient Mating Material?
Insufficient mating material occurs when one or both players lack the pieces needed to checkmate the opponent.
If you look at the draw notice, it says Draw due to timeout vs insufficient mating material - This means one player does not have enough pieces to checkmate the other.
What causes the Insufficient Mating Material draw to trigger?
Reason | Explanation |
If both players have insufficient mating material | If there are not enough pieces to checkmate the opponent then the game will end in a draw immediately. |
If one player has insufficient mating material | In this scenario, the game continues because the opponent still has a chance for checkmate. However, if the player with more pieces runs out of time, the game will be declared a draw due to insufficient mating material.
This rule is in place because the player with insufficient material cannot win; the game can only end in a draw or a win for the player with more pieces. Thus, a draw may still occur if one player runs out of time. |
King + Two Knights exception
Although a king and two knights are generally considered insufficient mating material in most situations, a timeout against these pieces does not result in a draw.
If your opponent has only a king and two knights, and you run out of time, you will receive a loss instead of a draw. This exception exists because a king and two knights technically have the potential to checkmate an opponent, even if it is not a forced checkmate.
A Summary of Insufficient Mating Material Situations
Here is a table showing what happens with different combinations of timeouts and insufficient mating material:
Insufficient mating materiale.g Just a King | Ran out of timeClock hits zero |
Result |
You | You | You lose on time |
Opponent | Opponent | The opponent loses on time |
You | Opponent | Draw by insufficient material - You cannot win on time but you get the draw |
Opponent | You | Draw by insufficient material - The opponent cannot win on time but gets the draw |
Check out this article for more information about insufficient mating material: What does ‘insufficient mating material’ mean?