The common rule is that once the three kings are set they have 13 moves to win.
Both Gonyaev' Shtyk
and Petrov's Triangle work but
Petrov's Triangle is easier to remember.
There are three stages:
Stage 1 - take both double lines.
Stage 2 - while on double line take one of tripple lines, this forces the opposing king to leave the other tripple line.
Cut the remaining open space on the tripple line
Important! You set two possible heads of the triangle, with next move the third king will move into the remaining "leg" position.
Stage three - set the triangle - it looks like a man with two feet and the head towards the opposing king.
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