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Tweak safe guessing chances and provide a detailed rationale. #44958

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merged 1 commit into from Oct 19, 2020
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Tweak safe guessing chances and provide a detailed rationale. #44958

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12 changes: 9 additions & 3 deletions src/iexamine.cpp
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Expand Up @@ -1417,9 +1417,15 @@ void iexamine::safe( player &guy, const tripoint &examp )

if( !( !cracking_tool.empty() || guy.has_bionic( bio_ears ) ) ) {
guy.moves -= to_turns<int>( 10_seconds );
// Assume a 3 digit 90-number code, but safes allow adjacent dial locations to match,
// so 1/30^3, or 1/27000 odds.
if( one_in( 27000 ) ) {
// Assume a 3 digit 100-number code. Many safes allow adjacent + 1 dial locations to match,
// so 1/20^3, or 1/8,000 odds.
// Additionally, safes can be left-handed or right-handed, doubling the problem space.
// The dialing procedures for safes vary, I'm estimating 5 procedures.
// See https://hoogerhydesafe.com/resources/combination-lock-dialing-procedures/
// At the end of the day, that means a 1 / 80,000 chance per attempt.
// If someone is interested, they can feel free to add a proficiency for
// "safe recognition" to mitigate or eliminate this 2x and 5x factor.
if( one_in( 80000 ) ) {
guy.add_msg_if_player( m_good, _( "You mess with the dial for a little bit… and it opens!" ) );
get_map().furn_set( examp, f_safe_o );
return;
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