THE ENGLISH SCHOOL OF ANALYSIS: "The word "combination" means different things to different people." "... I bid farewell to my readers in the hope that they have formed their own opinion as to the meaning of the word "combination"." The Chess Combination from Philidor to Karpov
"(3) 'IS IT A SYSTEM...?'
... Ultimately, I suspect, this is a question about which the reader should form his own judgement by study of the original text."