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8/8/4q3/5R2/8/5R2/1KP3k1/8 w - - 0 1
Wilhelm sais white will win in 100 moves, but can't show the line, apparently because one position can't be probed.
The position which can't be probed is one move after (black to move):
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8/8/4q3/5R2/8/8/1KP2Rk1/8 b - - 0 1
In this position Wilhelm sais "Unknown", it does not know if it is winning or not.
I believe my KRRPKQ tablebase set is full and correct - 16 files with MD5 (I just re-checked the MD5):
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91b0a26b66679ac67263f27da908ecf3 krrpkq.0.nbb.emd
13bfd39728547698f32f7f74880bfe8f krrpkq.0.nbw.emd
a1f9f7051b3e8649dbcdfaa3de749748 krrpkq.1.nbb.emd
bdddde20f42e4314b4afe38e53750f21 krrpkq.1.nbw.emd
cae48bd7c39558a7d631dd0b2fefe034 krrpkq.2.nbb.emd
4a9f407cb99e444f1ff2b8b62b14421b krrpkq.2.nbw.emd
f4737ce74a984fc862924b87a2543a76 krrpkq.3.nbb.emd
f41f24918cfe90d5e5062ba706bcf65a krrpkq.3.nbw.emd
329f7559d0d517bb61806444e7aa6e0a krrpkq.4.nbb.emd
42cc7eaeb7a2846dd45b61257573c22f krrpkq.4.nbw.emd
237bc1d628b44a38461248c8b069134a krrpkq.5.nbb.emd
47726d10ccf7d59b56369ce4fc6e1705 krrpkq.5.nbw.emd
3e5e7c179ba3bf904d91a2deed54cd7e krrpkq.6.nbb.emd
7d72013a837fd6d9ae1e16cea62b7905 krrpkq.6.nbw.emd
b677018e5f68eea90389f3e8bf55a7a1 krrpkq.7.nbb.emd
d9579a77f95890318a7a6ffc08abe5e4 krrpkq.7.nbw.emd