My international game puzzle rating is shown with a question mark, while I've answered more than 3,000 puzzles. What's the reason for this question mark?

Puzzle 1371: The forcing 1. 31-27 is also winning. Afterwards 22-18 and then several moves to win.

Puzzle 1369: 1. 37-31 is also a good combination.

Puzzle 1327: 2. 22-18 and afterwards 18-12 and 27-21 (or 27-21 and 18-12 of course) is the same combination.

Puzzle 1315: 2. 29-24 is also winning.

Puzzle 1301: 40x07 is also winning, in addition of the comment of Tim.

Puzzle 1282: 1. 33-28 is also winning.

Puzzle 1180: 4. ... 02x13 is the author defending.

Puzzle 1177: 1. 27-21 is also possible.

Puzzle 600: 4. 35-30 is also winning. Puzzle 609: Take a look at the comment of Tim. 1. ... 23-29 34x14 2. 18-23 is also winning, but way more expensive. Puzzle 634: 4. ... 03-09 is also winnin…