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Seirawan Chess

@IM opperwezen Yes, but the position isn't that clear after Nf3/Hg1. The queen must then retreat and White may have some activity then.
@Toadofsky
"I'm curious whether this S-Chess site still works:
http://hgm.nubati.net/VICS/"

Yes, this should normally still work, although it seems to have been down a few days, because the VPS was rebooted without me noticing. It is still on domain winboard.nl , port 5000. It supports variants like Seirawan, Spartan Chess, Gothic/Capablanca Chess, Xiangqi, Shogi.

Don't expect any people there, however. You can use it to play, but should bring your own opponent...

I also once set up a primitive turn-based server for Sairawan Chess, at http://hgm.nubati.net/schess/play.html , as an alternative for a group of people that wanted to set up an e-mail tournament. It never took off, though.
@HGMuller Thanks very much for your helpful response and for all the work you do! I'll make sure to bring my own opponent as I regularly enjoy playing chess variants.

I'll let my local club know of the email-based Seirawan Chess site.

May I set up one or more computer accounts as well? I've developed my own engine from scratch, and separately I'm interested in implementing Seirawan chess in my Stockfish fork (currently used by Lichess for other variants).
You are welcome to run computers on the variant server, but don't expect anyone to challenge them. Especially not in variants. I never really advertized this server in an attempt to attract players. I run it for testing purposes, and to organize a monthly computer blitz tourney for orthodox Chess. (As it happens the November tourney is scheduled for this evening.)

It would be great to have another S-Chess engine; perhaps we could organize a tourney for that too, one day. I am in possession of an old version of Komodo converted to S-Chess, which Don Daily once sent me for interfacing it with XBoard. And I did convert Fruit 2.1 to play S-Chess as well. (Although I seem to have introduced a bug that leads to occasional crashing when I implemented gating at the Rook square on castling, which I never got to fixing.)

As for a way to implement the gating in an interface, which was discussed earlier in this thread:
In WinBoard I used the method that Hawk and Elephant are initially displayed next to the board. To perform a gating move one first selects the piece one wants to gate in, by clicking it, and then performs the move on the board as usual. When using drag-drop moving the piece to be gated is revealed on the from-square as soon as you start dragging the piece on the first rank. This allows you to still abort the move if it is not what you want due to something going wrong during the selection of the off-board piece, and then try again.
S-chess would be a really cool idea if implemented.

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