The difference between Absolute pin and Partial pin
When used as nouns, absolute pin means a pin in which moving away the pinned piece would illegally expose the king to check, whereas partial pin means a pin where a rook or queen is pinned along a file, or a bishop or queen is pinned along a diagonal.
check bellow for the other definitions of Absolute pin and Partial pin
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Absolute pin as a noun (chess):
A pin in which moving away the pinned piece would illegally expose the king to check.
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Partial pin as a noun (chess):
A pin where a rook or queen is pinned along a file, or a bishop or queen is pinned along a diagonal.