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In the Random Map settings, set the values to 2-0-6-0 (as this specific sequence is required for 6LM10a), set the difficulty to 160%, and you can start playing...
We always played with 8-0-0-0, including on 6LM10a. However, if the AI splits its forces and captures a castle, which sometimes happens when it has a unit blocking the path to its castle and nowhere else to retreat, this can occur. With the 2-0-6-0 settings, it's theoretically impossible to fix this bug... Although the bug is quite rare, I encountered it 3-4 times in my games...