One who plays a game for pleasure and not professionally.
It has been established that
(P) Einstein was
(Q) although a great scientist
(R) Weak in arithmetic
(S) right from his school days
QPRS
QPSR
RQPS
SRPQ
The conclusions derived from experiments showed deviation from the common rule.
Some achievements
(P) have made
(Q) happier and more comfortable
(R) of science
(S) human life