You are White (move first); the engine is Black. Its whole brain is the five rules on the right. Pick a lens to paint one rule's thinking onto the board, then hover any piece to read why it matters. After you move, the board keeps the engine's top-3 replies as arrows (purple = played, grey = 2nd & 3rd choice), and "how it picked" spells out the math in words.
Your move — click a white piece.
🔍 Lens — paint ONE rule on the board (modes, not layers)
Each slider is a weight: the rule's raw score is multiplied by it, then all five are added into one number. Slide a weight to 0 and the engine ignores that rule entirely — set all five to 0 and it just plays the first move it sees (you'll crush it). Development and king safety default to on: turn both down to 0 and the engine plays exactly like the original three-rule brain; turn them up (the default) and it develops faster and hides its king, which measurably beats the three-rule version.
These five are the entire brain — no opening book, no endgame tables, no check-avoidance beyond what falls out of the rules above.
Make a move — the engine's reasoning shows up here, in words.