It's because you give up the most important squares e5 and g5. The crazyhouse evaluation is tricky and that variation is a common trick. Knights are useless if the opponent king is completely safe. I can use that pawn on e4, h3 or h6 in different variants but your knight can't go to e5, can't go to g5... Also I have better development due to black's free c bishop. That bishop helps the idea of h3 or it comes to g4 and pins your knight etc etc. But white has ideas too, starting with having an extra knight, white can sacrifice a bishop on f7 and sacrifice the extra knight on g5 if f3 knight can sit long in g5 square. So you take the extra knight to probably sacrifice. Otherwise, pawns will build a fortress for opponent king.MTaktikos wrote: ↑Sat Oct 22, 2022 10:00 pmNo, version 13 is not up to date. Here how to install the new engine (because this instructions are also for other readers who want to install an uci-engine in liground, and may even have not found the add-button, I think it's the best to give all the steps explicitly):lkaufman wrote: ↑Sat Oct 22, 2022 7:45 pm I downloaded liground; is the "Fairy Stockfish 13" included with it the same as or at least fairly close to the FSF with your recommended net for Crazyhouse? If not, how to I add an engine (there is an "add engine" button, but it's not obvious what to do after clicking it)?
1) After starting liground, set the chess variant to "Crazyhouse"
2) Click on "Settings"
3) In the right of the board, you can see the name of one of the installed engines, and in the right of this name, there are icons to edit this engine, to remove this engine from liground, or to add a new engine (+). Click on the add -icon
4) There pops up a mini window. Here you click on "Select path" and, after navigating through your HD folders, double-click on your file FSFCrazyhouse.exe.
5) Then edit in the mini window the first line (Name) with a name of your choice for the Crazyhouse engine (I took FSFCrazyhouse). And then click on the green button "Save" in the mini window
6) Then you set the mouse on the little arrow directly right of the engine name, and you can chose the name of the new defined engine (in my case, FSFCrazyhouse)
7) Continue to edit the settings, on my PC I edited Threads to 24 (instead of 1) and Hash to 4096 (instead of 16). Usually there is to edit also the nnue path, but in the engine I compiled it's predefined. Then click on the green "Save" button
8) Now the engine starts, you see below some extremely small lines that give the cmd output. Wait some seconds until no new lines are printed, then your engine is ready to analyze
9) Then you go to the big button in the right of the engine name (FSFCrazyhouse), click on it, the analysis starts, and you can move the pieces on the board and also take moves back, while the analysis is adapted to every new position
Tried to move back and forth, but FSF remains in this line and evaluates White's advantage as +1.94, see the picture belowRegarding your above main line, 1.e4 Nf6? 2.e5 d5?? 3.d4??, how can that possibly be good play? I don't know if you are a chess or shogi player, but it is absurd to think that winning a knight for a pawn on move 3 can be bad, even in Crazyhouse. Black blunders the knight, White declines!!
OK, let's not decline the knight capture, we move 3. e5xf6. The liground analysis gives FSF's answer 3... e7xf6, and then, looking at the evaluation, hm, FSF obviously "thinks" that White blundered and that Black can now reach a draw. Are you sure, that this must be an evaluation error, or is it possible, that FSF can see something that we don't see?
The main idea is initiative and king safety in crazyhouse is and must be almost equal to QueenMg Value in Standard Chess Stockfish. There are games that one player sacrifices almost 10-15 pieces to get opponent king into a mate net, games with 3 pieces sacrifice to build a pawn fortress.