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Originally Posted by Dmitriy ObukhovDmi
Are you sure 64D is even more complicated? I am not.
In any way, you get mostly situations which are different from S. You have more ammunition to attack his back checkers, which often leads to a hitting back and forth. Probabably the advantage is mainly against a weak opponent. Generally speaking, I have the feeling that timing issues become more complicated.
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Moreover, assuming replies are played correctly, I feel that if you are missed after this aggressive play, the game will become static more often after playing two down than after splitting.
Many combinations lead to a homeboard point, with or without a blot. In case he played also two checkers down, you can make your point and leave the 7 point slotted. 31,51,63,33,55 play somewhat less, depending on the situation. You can always try to hit loose.
Suppose 30% of the 40% nonhitting games get more static. 62, 63,64,(65) make up 25%. That's a total of 3%, and you can get a lot of spectacle back.
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On average game gets more complicated for 2nd player who ends up with more checkers back than the 1st player. I don't have enough experience with 64D to claim that you will be facing more difficult decisions, but I certainly feel so.
You are the better player, and you will be more knowledgeable about this point. Again, let's leave the laboratory and get into the real world of backgammon. This is certainly related to skill gap. Often it is the opponent who has more checkers back. Perhaps 64D could also seduce the opponent to play more careless. I got so obsessed with the 64 thing that my mind was playing checkers allnight. I hope there are some open minds out here to do research.
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Also, note that your gain when missed is not as big as it might appear At 1st sight. Assuming you opponent plays correctly his replies the game plans are very likely to be priming games. Note that he usually misses with small numbers. This means he will be down in the race when this happens. It is more likely than after opening 51$ (13/8 6/5) to end up on the wrong side of timing battle.
By the way, 51 is the worst move of the whole bunch. I tried the first 12 missing plays up to six moves against an average player (intermediate level), and in 4 of them I have a priming game, and in just 1 the bot has one:
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studio screenshot
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screen capture open source
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And what about those back games when he hits you couple times? O.K. He will be making more mistakes than usual, but consider how he might be playing a backgame himself if you split instead, and there is hitting back and forth going on.
I have done an extensive rollout of worldclass against intermediate level. Unfortunately my computer crashed after about 7000 untruncated rollouts, but i have been following the process and apart from the cubefull issue, there is not much equity difference. The same is true for wordclass vs advanced level. S has a small advantage over D in the laboratory, which could be fully cancelled out if placed in the field of humanities.