Congratulations to those of you that made it this far! The first two challenges were quite easy, but these next few are going to ramp up in difficulty. More puzzles (some are variants)!

The code to the next challenge is a concatenation of the number of plys (not moves) in each puzzle solution, converted to letters (all caps). For example, if there are three puzzles, the code could be as follows:

If there are 3 plys in the solution to the first puzzle, 4 in the second, and 1 in the last, then the code would be CDA, as the number 3 corresponds to the letter C, 4 corresponds to D, and 1 corresponds to A.

Note that the variants puzzles may have a lot of continuations, so they are only bonus puzzles. You may privately message me with your answers to them. You will be awarded 1 point for each puzzle you solve, and 2 bonus points if you solve all of them. THEY DO NOT CONTRIBUTE TO THE CODE!!!

Puzzle 1 (White to Move):

Puzzle 2 (Black to Move):

Puzzle 3 (Teams, Yellow to Move - Find a winning continuation):

Puzzle 4 (White to Move):

Puzzle 5 (White to Move):

Puzzle 6 (Black to Move):

Puzzle 7 (Black to Move):

Puzzle 8 (Atomic, Black to Move - Find a forced mating sequence):

Puzzle 9 (Crazyhouse, White to Move - Find the fastest mate):

Puzzle 10 (White to Move):

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