Title (only) inspired by Don't bully your little sister at chess


Well, this happened when I played Reversi with my cousin a few days ago...

enter image description here

I, not being as nice as @Arnold :P, I decided to continue to bully my cousin, but to cut her pain.


  • Each move, no matter white or black, must capture pieces
  • This is a circumstance where your enemy is not a perfect logician, (like my cousin XD), so you may assume that your opponent is helping you.
  • You can choose beinhg white or black.

The Puzzle

Create a circumstance of X-0 or 0-X with minimum X.


Less steps needed wins

OP's Words

is temporary. Please feel free to retag for me. Thanks!

  • $\begingroup$ Welp, I already know someone solved this before and probably the least we could do... $\endgroup$
    – athin
    Aug 13, 2019 at 13:09
  • $\begingroup$ Thanks for the reference :) nice problem! It's a pity that the solution can be found online as @athin pointed out. $\endgroup$ Aug 13, 2019 at 14:56
  • $\begingroup$ Well in fact I'm not completely sure I understand the question, because if it means what I think it means, then there can be no tie-break as indicated: the amount of steps needed is always equal to X-4. $\endgroup$ Aug 13, 2019 at 15:41
  • $\begingroup$ @Arnaud really? if so, can you prove it while providing the answer? i'll give you the checkmark then :) $\endgroup$ Aug 13, 2019 at 15:45
  • $\begingroup$ Related: boardgames.stackexchange.com/questions/39166/… $\endgroup$ Aug 13, 2019 at 15:56

1 Answer 1


Remark regarding the tie-breaker rule:

After each move, the total amount of stones (black or white) increases by $1$ (and so does the amount of moves!). Since there are four stones on the board before any move is played, it follows that a score of $X:0$ can only be reached after $X-4$ moves. Therefore there will never be a tie-break in the way that is indicated in the rules.


$13:0$ after $9$ moves enter image description here


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