"Newcomer-2011. Summer"

Amiloo, in reality, a player who leaves the game after a loss automatically confirms their defeat.

That's not quite right. A player has the right to save the game and then contact a judge with that save file. Another point is that the strength of the block should be determined BEFORE the attack, not after. When determining a disputed moment regarding a block, or any other disputed moment, I recommend the following procedure: 1. Save the game, but don't leave the game. (So that if the turn time runs out, there is an opportunity to return.) 2. Explain the situation to the opponent and try to reach a compromise. 3. If a compromise cannot be reached, contact a judge or organizer. 4. If there are none available online, inform the opponent and leave the game with a clear conscience. 5. Wait for the judge and their decision.