Unclear why this is an invalid move about rchess

[jbkunst]

> library(rchess)
> library(magrittr)
> 
> chss <- Chess$new()$
+   move("g4")$
+   move("e5")$
+   move("f3")
> 
> chss$moves()
 [1] "Nc6"  "Na6"  "Qe7"  "Qf6"  "Qg5"  "Qh4#" "Ke7"  "Be7"  "Bd6"  "Bc5"  "Bb4"  "Ba3"  "Nh6" 
[14] "Nf6"  "Ne7"  "a6"   "a5"   "b6"   "b5"   "c6"   "c5"   "d6"   "d5"   "f6"   "f5"   "g6"  
[27] "g5"   "h6"   "h5"   "e4"  
> 
> plot(chss, type = "ggplot")

You can't move the queen yet.

chess.js dont give more explicit messages and I just verified if the move you want to do exist in the possible moves.

[pssguy]

I see now.
You have to put the checkmate in i.e. "Qh4#"