What does Lucky Chess Board do in CK3?

Stress Gain -4% (patch 1.20.0.3).

How do you get Lucky Chess Board with the console?

effect create_artifact_fp2_2p_chess_board_effect = { OWNER = root } — runs the scripted effect that makes it, for the character you play (debug mode).

Personal artifact · Trinket

Lucky Chess Board

CommonThe Fate of Iberia

Lucky Chess Board is a common trinket artifact in Crusader Kings III: Stress Gain -4%. Quality 15 and wealth 15; maximum durability 60. It needs The Fate of Iberia. Patch 1.20.0.3, from game/common/scripted_effects/03_dlc_fp2_scripted_effects.txt.

Quick answers (2)

What does Lucky Chess Board do in CK3?: Stress Gain -4% (patch 1.20.0.3).
How do you get Lucky Chess Board with the console?: effect create_artifact_fp2_2p_chess_board_effect = { OWNER = root } — runs the scripted effect that makes it, for the character you play (debug mode).

Instrumental in a resoundingly successful game against …, this tool of leisure first brought its patented luck to ….

Effects

Stress Gain-4%

How it is made

The game creates it with the scripted effect create_artifact_fp2_2p_chess_board_effect. In the console (how to open it), this gives it to the character you play:

effect create_artifact_fp2_2p_chess_board_effect = { OWNER = root }

Built from the effect's file; not run in the game by us.

Source: game/common/scripted_effects/03_dlc_fp2_scripted_effects.txt, common/modifiers (artifact_stress_gain_2_modifier) and the English localisation, Crusader Kings III 1.20.0.3.