Ok, this was fun (as always a little bit sobering to see the better solutions..), though strangely, so few people attempt this one. I think it might be a good idea to give a little more introductory info on the game rules like:
"(Mega)Connect4 is played on a vertical, rectangular board. The players tokens drop in a column and stack on top of each other. The win condition is met when the token of the current move connects N-1 other tokens of the same kind in a vertical or horizontal line or a line parallel to the boards diagonals."

Kata could be made more user friendly by either:

• making sure a clean solution shows all random test batch sizes (it now throws Max Buffer Size Reached (1.5 MiB), even without logging anyting) -> this part is really an ISSUE
• add something to the description about random test batch sizes

For now it's a black box, and doesn't help users figuring out how much optimisation is required.

Not helpful at all. Even on a clean solution, no logs, we are not able to see how many tests there are, and of which sizes.

Max Buffer Size Reached (1.5 MiB)

There is a room for performance improvement, but this kata is not about performance

interesting solution ;)

Thank you, found my mistake

first test: (pieces, result)

([[[0, 0, 1, 1, 0, 0], [0, 1, 1, 1, 1, 1], [1, 1, 1, 1, 1, 0], [0, 1, 1, 1, 1, 0], [1, 1, 1, 1, 1, 1], [1, 0, 1, 0, 1, 1]], [[0, 1, 0, 0, 1, 1], [1, 1, 1, 1, 1, 1], [0, 1, 1, 1, 1, 0], [1, 1, 1, 1, 1, 0], [0, 1, 1, 1, 1, 1], [0, 0, 1, 1, 0, 1]], [[0, 0, 1, 1, 0, 1], [1, 1, 1, 1, 1, 1], [0, 1, 1, 1, 1, 0], [1, 1, 1, 1, 1, 0], [0, 1, 1, 1, 1, 1], [0, 0, 1, 1, 0, 0]], [[0, 0, 1, 1, 0, 0], [0, 1, 1, 1, 1, 0], [1, 1, 1, 1, 1, 1], [1, 1, 1, 1, 1, 1], [0, 1, 1, 1, 1, 0], [0, 1, 0, 0, 1, 0]], [[0, 0, 1, 1, 0, 1], [1, 1, 1, 1, 1, 1], [0, 1, 1, 1, 1, 0], [0, 1, 1, 1, 1, 0], [1, 1, 1, 1, 1, 1], [1, 1, 0, 0, 1, 1]], [[0, 0, 1, 1, 0, 0], [0, 1, 1, 1, 1, 1], [1, 1, 1, 1, 1, 0], [1, 1, 1, 1, 1, 0], [0, 1, 1, 1, 1, 1], [0, 1, 0, 0, 1, 0]]], [[[0, 0, 1, 1, 0, 1], [1, 1, 1, 1, 1, 1], [0, 1, 1, 1, 1, 0], [0, 1, 1, 1, 1, 0], [1, 1, 1, 1, 1, 1], [1, 1, 0, 0, 1, 1]], [[1, 0, 1, 1, 0, 0], [1, 1, 1, 1, 1, 1], [0, 1, 1, 1, 1, 0], [0, 1, 1, 1, 1, 1], [1, 1, 1, 1, 1, 0], [0, 0, 1, 1, 0, 0]], [[0, 0, 1, 1, 0, 0], [0, 1, 1, 1, 1, 1], [1, 1, 1, 1, 1, 0], [0, 1, 1, 1, 1, 0], [1, 1, 1, 1, 1, 1], [1, 0, 1, 0, 1, 1]], [[0, 0, 1, 1, 0, 0], [0, 1, 1, 1, 1, 0], [1, 1, 1, 1, 1, 1], [1, 1, 1, 1, 1, 1], [0, 1, 1, 1, 1, 0], [0, 1, 0, 0, 1, 0]], [[0, 1, 0, 1, 0, 0], [1, 1, 1, 1, 1, 0], [0, 1, 1, 1, 1, 1], [0, 1, 1, 1, 1, 1], [1, 1, 1, 1, 1, 0], [1, 1, 0, 0, 1, 1]], [[0, 0, 1, 1, 0, 0], [0, 1, 1, 1, 1, 1], [1, 1, 1, 1, 1, 0], [1, 1, 1, 1, 1, 0], [0, 1, 1, 1, 1, 1], [0, 1, 0, 0, 1, 0]]])

What is the solution for first fixed test in python? I can solve all random tests but, can't find solution for 1, 3 fixed tests.

:)

Arrgh! Even there, you sneaky bastard :)

In this this Kata you need to make your program without any capital letters

Generally you're correct but there are specific limitations in this kata which prevent you from doing that

It's Java not JavaScript. Classname should start with uppercase and use camelcase.

public class BrokenShift {
	public brokenShift() {}
}

@rwood112 wait so is rollback(1) trivial? I was under the assumption that the argument for rollback denoted the number of moves to undo.

Done

.