How to create opening library for bughouse chess playing Sjeng engine ?

• Create text file (in notepad) bug.opn in subdirectory where Sjeng is (typically DoubleChessBoard1_22\Engines\Sjeng85\)
• In bug.opn You can write variants as lines, one row is one variant, if more variants is playable in the same time, Sjeng will select one randomly.
• Example:
  e2e4 d7d5
  e2e4 g8f6
  e2e4 b8c6
  means that Sjeng as black will play as response on 1.e4 d5 or Nf6 or Nc6

Bughouse chess opening library for Sjeng - Hints

• You can sign moves by ? or !
  Moves with ? will Sjeng never play, but will use library to play moves which are wrote as reaction.
  Moves sign ! will always be preferred.
  
  Example:
  h2h3? e7e5
  e2e4 h7h5? d2d4!
  e2e4 h7h5 d2d3
  
  Sjeng will never play as white 1.h3 and never 1.-h5 as black if white plays 1.e4, but Sjeng as white after playing 1.e4, if black will play 1.-h5 will always play 2.d4 and the line e2e4 h7h5 d2d3 has no sense here.



• In variants can be also pieces drops, use @ character, if Sjeng has in stuff the piece, it will play such move, attention: the droped pieces has to be in lowercase (some sjeng speciality :)) !
  Example:
  g1f3 p@f6 n@g5? f6g5 f3g5 g8h6
  g1f3 b@f6 n@g5? f6g5 f3g5 g8h6
  
  
  Attention:
  Example:
  g1f3 p@f6 n@g5? f6g5 f3g5 g8h6
  g1f3 b@f6! n@g5? f6g5 f3g5 g8h6
  
  This is bad, because if Sjeng as black will not have Bishop to drop B@f6,
  it will not play p@f6, even if will have pawn in hand, but will simply ignore this by ! not signed alternative and will think instead what to play.
  
  so right is or
  g1f3 p@f6 n@g5? f6g5 f3g5 g8h6
  g1f3 b@f6 n@g5? f6g5 f3g5 g8h6
  or
  g1f3 p@f6! n@g5? f6g5 f3g5 g8h6
  g1f3 b@f6! n@g5? f6g5 f3g5 g8h6
  
  
• Examples:
  b2b4 b7b5 a2a4 b5a4 a1a4 d7d5 g1f3 p@f6
  
  if will play 4 Sjengs and only this in opening library, they will always drop Pawn on f6 in 4. black move.
  
  
• Probability/frequency with which will Sjeng play some move, is simply given numbers of lines that including that move in given position.
  Example:
  e2e4
  b2b4
  b2b4
  b2b4
  b2b4
  b2b4
  b2b4
  b2b4
  b2b4
  b2b4
  
  Sjeng will in 10% play 1.e4 and in 90% 1.b4
  


• Opening library example : bug.opn (mattjb), bug2.opn (SKAcz)
• Sjeng reading opening book always when new game stars, so You can continuously after every game (or after opening) improving moves in library without restarting this chess engine.