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Previous Puzzle


If you're having trouble understanding the key/lock thing, watch this until 9:30 which might be a better explanation of what I'm trying to say

General Rules:

  • In this puzzle, you control kn (knight) and r (rook)
  • You are trying to capture ok (opponent's king)
  • If one of your pieces touches ok, ok is captured.
  • Walls can be jumped over by knights, and floors can be passed through in any direction by any piece but cannot be fallen through.
  • Pieces fall until they are blocked by a wall, floor, or a piece that you control.
  • Walls and floors can be passed through by kn.
  • Gravity affects all pieces including ok.

New gimmick ruleset:

  1. Lock
  • A lock (represented by l) cannot be passed through by any piece. It requires a piece that you control to touch something labeled ke (key), and then all squares labeled l will disappear.
  1. Key
  • A key (represented by ke) is what is required to get rid of locks. However, say we have this situation:
+---+---+---+
|   |ke |   |
+---+---+---+
|kn | l | l |
+---+---+---+
| l |   |   |
+---+---+---+

Here we have a knight at R2C1. Since no piece can pass through a lock in any direction, the only place the knight can go is R1C3. However, it isn't going to pick up the key. This is basically because the knight "teleports" to R1C3.

+---+---+---+
|   |ke |kn |
+---+---+---+
|   | l | l |
+---+---+---+
| l |   |   |
+---+---+---+

*The same can be said for the rook and queen (q): (r/q means "rook or queen")

+---+---+---+          +---+---+---+
|r/q|ke |   |    1     |   |ke |r/q|
+---+---+---+   -->    +---+---+---+
| l | l | l |   move   | l | l | l |
+---+---+---+          +---+---+---+

and the bishop

+---+---+---+          +---+---+---+
|   |   |   |    1     |   |   | b |
+---+---+---+   move   +---+---+---+
|   |ke | l |    ->    |   |ke | l |
+---+---+---+          +---+---+---+
| b |   | l |          |   |   | l |
+---+---+---+          +---+---+---+

However, concerning gravity:

  • If a piece is being affected by gravity and there is at least one cell between where said piece starts falling and where it lands (whether it be on a black square, lock, other piece, or disintegrated by lava) that contains ke, then the key(s) will be counted as being picked up and all squares represented by l will disappear.
  1. Lava
  • No piece can pass through lava. (in text versions, this will be represented by lav)
  • Lava automatically disintegrates any piece that it touches. (the piece that touches the lava is removed from the board)

The puzzle:

enter image description here

Now my question to you is:

What is the minimum number of moves needed to capture ok?

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1 Answer 1

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8 moves

Knight moves: RDDf1, RRDf1, URR, RRD(Uf2 also works), UUR, RRDf1(Uf3 also works), RRUf1. This is the quickest the knight can possibly move far enough right, as column 5 doesn't contain a lock. This is then followed by rook to column 4 or 5, falling into a key and then into lava, while the opposing king falls onto the knight.

Basically, the rook can only grab a key, and doing so will drop the opposing king on the only surviving land, where our knight must already be.

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