Endgame, also referred to as yose, is the end of the game, as the name might suggest. In Go, the value of moves get smaller towards the end of the game. And as the game approaches the end, it becomes possible to express the value of a move in an exact number points.
what's the value of investing a move here?
to count the value of an endgame move, we compare the situation as black plays there and the situation as white plays there. Here black has 6 points and white has 5 points.
and if white plays first, black has 5 points and white has 6.
The endgame is worth 2 points (and for the more advanced, there is also a difference of 3 ko threats).
Since the endgame is gote for both sides, when you try to estimate the score you can add the two triangled stones. It means that both players have an equal chance of getting the endgame. It is pretty accurate, if you want to be more accurate, you'll have to play the endgame to the end in your head.
Next is this situation... Try to take a guess about the value of the yose first.
This situation is different from the previous one since white has to protect at 4. The sequence is sente for black.
If 4 is omitted, bad things happen.
So we learned we have to compare the situation when black plays first to the situation when white plays first. Note that for white, the sequence is gote. The difference in territory is marked by the 3 green Xs. For black, the endgame is sente 3 points. For white it is gote 3 points, which is called reverse sente since it prevents black from playing it in sente. In this case the value is doubled (an approximation for your brain), 3 points reverse sente = 6 points gote.
For score estimation, it is safer to assume that black gets to play his sente sequence.
to be continued
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