diff --git a/src/bh/ttt.logo b/src/bh/ttt.logo
index 6a3be211..a096f003 100644
--- a/src/bh/ttt.logo
+++ b/src/bh/ttt.logo
@@ -1,6 +1,48 @@
 ;;; Tic-Tac-Toe Game written by Dr. Brian Harvey
 ;;; Adapted to PDP-10/ITS LLOGO by Alexey Slyusar
 
+;; OVERALL ORCHESTRATION
+
+TO TTT
+10 LOCAL 'ME
+20 LOCAL 'YOU
+30 LOCAL 'POSITION
+40 DRAW.BOARD
+50 INIT
+60 IF ALREADY.WONP :ME [PRINT [I WIN!] STOP]
+70 IF TIEDP [PRINT [TIE GAME!] STOP]
+80 YOUPLAY GETMOVE
+90 IF ALREADY.WONP :YOU [PRINT [YOU WIN!] STOP]
+100 IF TIEDP [PRINT [TIE GAME!] STOP]
+110 MEPLAY GETMOVE
+END
+
+TO MAKE.TRIPLES
+10 OP MAP "SUBSTITUTE.TRIPLE [123 456 789 147 258 369 159 357]
+END
+
+TO SUBSTITUTE.TRIPLE :COMBINATION
+10 OP MAP [ITEM ? :POSITION] :COMBINATION
+END
+
+TO ALREADY.WONP :PLAYER
+10 OP MEMBERP (WORD :PLAYER :PLAYER :PLAYER) (MAKE.TRIPLES)
+END
+
+TO TIEDP
+10 OP NOT REDUCE 'OR MAP.SE 'NUMBERP LISTARRAY 'POSITION
+END
+
+TO YOUPLAY :SQUARE
+10 DRAW :YOU :SQUARE
+20 SETITEM :SQUARE :POSITION :YOU
+END
+
+TO MEPLAY :SQUARE
+10 DRAW :ME :SQUARE
+20 SETITEM :SQUARE :POSITION :YOU
+END
+
 ;;COMPUTE PROGRAM'S MOVES
 
 TO PICKMOVE :TRIPLES