The site’s replayer is a unique and useful tool, but there are some features of it the seem to a few little known that should be more widely known.
While there are questions about how to implement it, annotate the games, add annotation symbols and flip the board, I have found a couple of features that have been brushed off to the side. I want to make a list of such features here for others to use as a reference.
A useful but seemingly untalked about (other than a single answer on the question about adding a replayer in a post) that allows the replayer to begin playing the moves anywhere in the middle of a game or the move sequence.
[startply ""] in the bottom line, and add the half-move number, or ply, of where you wish to start in between the quotation mark-like symbols like below. Add four spaces in front of the entire thing.
An odd number means that White will move when the play arrow is clicked/tapped/pressed on, and an even number will mean that Black will move.
[startply "1"]will start with White's first move
[startply "2"]will start with Black's first move
[startply "3"]will start with White's second move, etc
This feature has been used only a few times, with this question being one of the earliest known uses of it. This seems to be a completely obscure feature of the replayer.
It is useful for skipping either side turns. While reasons for doing so are uncommon (such as to demonstrate a seriesmover problem or show a series of uninterrupted moves by one side), it still serves a purpose.
To use it, simply put the word
null where a move would usually go.
Here’s an example.
[FEN ""] 1. e3 null 2. Qf3 null 3. Bc4 null 4. Qxf7#
Does anyone know of any other examples? Feel free expand this list and/or improve it.