generalize more script to new multipv format

[robertnurnberg]

No description provided.

[Copilot]

Pull request overview

This PR updates the EPD-parsing logic in the matestats.py and diffmates.py helper scripts to support a newer “multipv” style where bm may be absent, and to skip comment lines.

Changes:

• Update the EPD regex in both scripts to capture a 4-field FEN prefix and make bm #...; optional.
• Ignore # comment lines in both scripts.
• In matestats.py, adjust the “loaded” summary and average computation to use the count of positions that actually have bm values.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
matestats.py	Makes bm optional and updates summary/average output; adds comment-line skipping.
diffmates.py	Makes bm optional, skips comment lines, and avoids treating missing bm as “missing position”.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

Comments suppressed due to low confidence (1)

matestats.py:32

• bm is an int or None, but if bm: treats 0 as falsey and would skip counting/plotting a valid bm #0; value if it ever appears. Use an explicit None check so all numeric bm values are handled consistently.

                if bm: