Chessmaster 3000 Opening Book
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| Extensions | .dat |
|---|---|
| MIME types | application/octet-stream |
| Signatures | 43686573736d61737465722033303030204f70656e696e6720426f6f6b at byte 0 |
| Wikidata | Q105855902 |
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From Wikidata. Updated 2026-10-20.