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In "playing" mode with my view to the opening moves for training. Usually using GM+ book.
I'm playing and then all of a sudden I'll be "out-of-book" status with NO moves showing. I continue play and find that HIARCS continues to make quick-like book moves for maybe up to the next 3 moves.
Time frame is like 90 minutes for game so after it is beyond these moves most of the thinking time for HIARCS is at least 3 minutes or so.
What is going on in those fast moves post-book????
There is only one reason, why you don't see any of those moves. HIARCS books sometimes contains moves that are included without statistics. Moves without statistics are not visible in "View opening explorer". Same issue is with offline Tournament book.