initial positionEquipment
The board is coloured in the concentric manner of a square archery target, with the successive shades of the rainbow: Red through to Violet. The centre square is called the Throne.

  • There are 48 reversible black/white pieces – plain and circular.
  • The Throne is initially empty but may be occupied by a black or a white King (which happens automatically if required).

Setting up
At the beginning of the game, Black and White have 24 pieces each on the board. These are randomly disposed on the outermost band, with the sole proviso that every piece must have a piece of the adverse colour diametrically opposite (Fig 1).
At Mindsports a set-up will be generated automatically unless players decide otherwise. Face to face, it is arrived at as follows: Black places, anywhere on the outermost band a black piece and a white one will automatically appear diametrically opposite. Then White places two such pairs, after which the players alternately proceed placing two pairs until the border is filled. Neither King is on the board at start of play.

Winning
At the start of the game the Throne is vacant, but it may in the course of play be occupied by either King. Once occupied, it may subsequently change hands any number of times from Black to White or vice versa. The winner is the player whose King is on the Throne at the moment when the game ends. If the Throne remains vacant from start to finish, the game is drawn.

Moving
Black moves first afrer which players take turns to move one piece of their own colour. A piece may move any distance and in any direction along an orthogonal or diagonal line, subject to the following conditions:


  • It must land upon a coloured band nearer the Throne than the band on which it stood before the move, though it may cross an axis of the board in so doing. Thus, in Fig 2, the white piece at A5 may move to B5, but equally to L5 (or any square in between); likewise, to anywhere on the diagonal from B6 to H12 or from B4 to D2. But the squares I13, M5 and E1 are unavailable to it, as are all those along the A file.
  • It cannot cross or land upon any cell occupied by another piece, whether friendly or hostile.
  • It may cross the Throne while the latter is still vacant, but not once it is occupied.
  • It cannot in any circumstances land upon the Throne.
  • Kings do not move at all. They simply occupy the Throne.



Capturing
Capture in Morelli is custodial capture, that is, it takes place when a moving piece comes to rest next to an adverse piece whose immediate neighbour on the opposite side, either orthogonally or diagonally, is a piece also belonging to the mover.

In Fig 3 the black piece at D1 would capture the white piece at B4 by moving to B3, or the one at E3 by moving to D2. If it moved to I6, six white pieces would perish at one fell swoop.

  • Captured pieces defect to the captor, changing colour accordingly.
  • A capture must be the immediate result of an active move by the captor during open play, hence pieces on the outermost band are at all times immune from capture.
  • A piece may be inserted with impunity between adverse pieces already in place. In Fig 3, for instance, the white piece at E3 could, if so desired, escape to E10 in perfect safety.
  • Captures are effected as part of the turn which gave rise to them and any capture arising from a given move must be effected.
  • Even if a captured piece completes, by virtue of changing colour, what would otherwise be the conditions for the capture of a further piece, that secondary capture is not permissible. In Fig 4 the White move G11-J8 captures the black piece at J7, but the latter’s change of colour does not trigger a ‘knock-on’ capture at K8.


Completing a frame
A frame is an arrangement of four pieces, all belonging to the same player, and

  • forming the corners of a perfect square, and
  • centred upon the Throne.

A frame may be completed by a move in various ways – namely:

  • where a missing corner is supplied by the moving piece, or
  • where a corner of adverse colour is converted by capture, or
  • both of the above at once.

Thus, in Fig 5, the Black move E3-D4 completes a frame at the Green corner. E3-E4, on the other hand, completes, by capture, a different and less obvious Green frame. And, spectacularly, the White move B7-F7 conjures an Indigo frame out of thin air by adding three corners at a stroke.


As with capture, the completion of a frame must be the immediate result of an active move during open play, hence no frames can be formed on the outermost band.

Occupying the Throne

  • Where a player’s move completes a frame, he must, as part of the same turn, enthrone his King, evicting his opponent’s if applicable.
  • Where the mover’s King already occupies the throne, no action results from the completion of a frame.


Ending
The game ends when either player, on his turn, has no legal move – or at any earlier moment by agreement between the players.


Using the Morelli applet
External links

Morelli © Richard Moxham
Java applet © Ed van Zon