Out of affection for him the blind king gave his son permission to play at dice (with the Pandavas). When Krishna came to know this, he became very angry.
अन्वजानात्ततो द्यूतं धृतराष्ट्रः सुतप्रियः। तच्छ्रुत्वा वासुदेवस्य कोपः समभवन्महान्॥