Routines
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A7EA: Character routine: Gollum waits for the answer
Next time, Gollum looks for an order given to him by the player (8907): the answer must be said to him, as in SAY TO GOLLUM "NIGHT". The words of the order are searched for the answer word stored in the riddle's entry (the CPIR loop). If the answer is there, all is well. If not, or if the player said nothing: 'someone strangles you from behind.', and Bilbo is dead (903C).
A7EA CALL $9C99 Dry run? Then just record that this would work, and return
A7ED SUB A Gollum is no longer waiting for an answer...
A7EE LD ($B5EA),A
A7F1 CALL $8907 Take the order the player gave Gollum (SAY TO GOLLUM "...") off the orders buffer; HL points at it
A7F4 JR Z,$A809 Nothing was said to him: Bilbo is strangled
A7F6 LD BC,$0018 Search the 24 bytes of the order...
A7F9 LD DE,($B5DF) DE = the riddle entry chosen at the start of the game
A7FD LD A,(DE) A = the low byte of the answer word (NIGHT or MAN)
A7FE CPIR Look for it in the order
A800 JR NZ,$A809 Not there: Bilbo is strangled
A802 INC DE Found: now check the high byte of the word
A803 LD A,(DE)
A804 DEC DE
A805 CP (HL) Does the next byte of the order match it?
A806 JR NZ,$A7FE No: keep searching the rest of the order
A808 RET Yes: the answer was right, and Bilbo lives
A809 CALL $9C99 Dry run? Then stop
A80C LD A,$01 Make sure the player sees the message
A80E LD ($B5F3),A
A811 LD HL,$B0CD "someone strangles you from behind."
A814 CALL $72D4
A817 JP $903C Bilbo is dead
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