When piggy888 wrote the post, we could all understand he's talking about this year score not trying to underestimate all players in Singapore. Therefore I think the add-ons are quite unnecessary. Otherwise if people continue and continue to add on, the sentence eventually becomes something like this and even worse:

<Based on this year's national open result, they are the 4 best players [out of all those participants {who had time to and dare play group A this year and who had no direct evidence in this competition showing them stronger than any playerer from group B or Ladies and who had drunk too much mineral water during this competition and wasted precious time to go toilet and...}] we have for this year>.

I guess you didn't play the tournament this year and missed a lot of fun. :P