The unlikeliest chess move part 2 – the heavyweights

Let’s dive straight into Queens, Rooks and Kings – in our search for the most unlikely move possible. The short version of this puzzle is that it requires you to come up with a notated move – so what you actually write on the scoresheet – that implies an unlikely position on the board.

Here’s part 1 if you missed the preamble.


Each piece on the chessboard has its own magical qualities – but let’s start with the most powerful. The Queen can do most manoeuvres available (knight moves, castling, promoting and ‘en passant’ they have some trouble with). But there is one other thing they can’t do – and that’s be the discoverer in a discovered check! (Try it out, they really can’t). Going back to our themes we are left with ‘Checkmate’, ‘Captures’, and ‘More than one of the same piece able to move to the same square’. My proposal nearly offered all three – until I realised that a capture actually makes the positions of the queens and kings less precise.


So its Queen b2 mate – but the ‘a1’ implies there must be another queen on the a-file, and a third on the 1st rank and both able to reach b2 – although a2 and b1 together is actually impossible as moving to b2 wouldn’t then attack any new squares).


Qa1b2# needs three queens on almost exact squares

The very close runner-up was the same but with the capture “Qa1xb2#” – it still implies 3 queens, but the other two could now be on a2 and b1, and the enemy king can now also be on the diagonal as well as the b-file or 2nd rank. On the flip side there must be a piece on b2 to capture.


Before we begin – and this may be contentious I don’t know – but despite its name ‘castling’ is actually a king move; you move the king first and the rook leaps over to the other side. So we’ll leave it to the kings. My proposed rook move is this:


Doesn’t sound so bad, right? A rook moves to b2 and delivers mate, and another one could also have done so. But here’s the catch; let’s say the rooks are on b1 and b3 – writing Rbb2# doesn’t clear anything up – you would write R1b2#, or R3b2#. So let’s think again – what if the rooks were on different files, say a2 and c2? Well then it becomes Rab2# – or Rcb2#… So what’s going on? The rooks have to be on a different file and rank – but then how do you deliver mate by moving a rook, when another rook already threatened all the new squares you threaten?? Okay you guessed it – discovered checks.


Rbb2# surprisingly implies a discovered check and mate.


I mentioned castling queenside (“0-0-0#”) to deliver mate in part 1, but is that the most unlikely? Although I have a hunch that castling kingside with mate is even less likely, I have not gone for either of these moves. The reason is only the practical one – if a player sees a chance to mate by castling, they are very likely to try to engineer it for the sheer aesthetic pleasure (or sadistic whim, depending on your outlook on chess). So I am going for the more prosaic:



The king can only discover a checkmate – taking a piece in the corner

Sadly there is no fun to be had with multiple kings, and there is no notation for stalemate. So the best for the king is a discovered checkmate on an unlikely square. But never fear, this is not the overall winner. The fun is reserved for the lightweight pieces – who are in action in part 3!


Mike Harris

Mike is a regular pretender in Bristol’s top division and can also be seen propping up local tournament ladders. He writes a regular column for the Bristol Chess Times and plays a solid 20 openings a season.

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