fix: more casino, economy, gameplay, security, and world data hardening gaps

1 files changed, 16 insertions, 0 deletions

diff --git a/building_guide/rooms.md b/building_guide/rooms.md
index ffe4f7b..568611f 100644
--- a/building_guide/rooms.md
+++ b/building_guide/rooms.md
@@ -268,6 +268,22 @@ its configured profit multiplier; otherwise play begins. Split hands can be
 configured independently for re-splitting aces and doubling, and split aces
 receive one card each with no further actions beyond a configured re-split.
 
+Two blackjack knobs are player-favourable and on by default, so set them
+explicitly when authoring a standard-rules table:
+
+- `split_unlike_ten_values: true` lets any two 10-valued cards split
+  (K+Q, 10+J). Standard play splits only identical ranks.
+- `double_split_blackjack: true` pays a 3+ card hand that reaches 21 after a
+  split and double as a blackjack (3:2). Standard play pays 1:1 for any 21 on
+  a split hand, doubled or not. Both raise the table's actual RTP above the
+  nominal blackjack payout.
+
+Baccarat's `banker_payout` (0.95 = a 5% commission) rounds the commission UP:
+a winning banker bet too small to carry a whole credit of commission returns
+only the stake rather than paying a commission-free 1:1. Payout multipliers
+are capped (`blackjack_payout`/`insurance_payout` ≤ 5, `tie_payout` ≤ 10,
+`banker_payout` ≤ 0.99) so a typo cannot silently create an absurd table.
+
 At a blackjack table, `bet` uses the configured minimum wager; `bet min`,
 `bet max`, and `bet <amount>` select the wager explicitly.