Network: Wet Grass
Classic Bayes Net: Rain → Wet Grass ← Sprinkler ← Cloudy → Rain
Marginal beliefs P(var=T):
Cloudy0.50
Rain0.50
Sprinkler0.50
WetGrass0.50
D-separation: X⊥Y|Z when all paths are blocked by Z.
Explaining away: If Wet=T, learning Rain=T reduces belief in Sprinkler — they "compete" as explanations.
Click nodes to toggle evidence (green=T, red=F).