In a short game in which I was moving Pawns out of the way to move the E piece, I tried each E piece, and it gave the error "g4 is empty" each time. Since g4 was in fact empty, I did a quicker game in which I just moved Pawns near the E and e piece before moving the E piece. This gave the error:
ILLEGAL: P i4-i5 on turn 1:
There was no P on i4. The piece on i4 is a E.
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For diagnostic purposes, here is the full movelist:
1. P i4-i5
1... p i9-i8
2. E j3-i4
I then took back the last move, cleared a space for the other E piece to move, moved an e piece, then moved the other E piece. This time, I got the error "i4 is empty".
So, it's looking like there is something wrong with the E piece.
In a short game in which I was moving Pawns out of the way to move the E piece, I tried each E piece, and it gave the error "g4 is empty" each time. Since g4 was in fact empty, I did a quicker game in which I just moved Pawns near the E and e piece before moving the E piece. This gave the error:
I then took back the last move, cleared a space for the other E piece to move, moved an e piece, then moved the other E piece. This time, I got the error "i4 is empty".
So, it's looking like there is something wrong with the E piece.