>>No it is completely different. Let say, we got a question that is not quite clear, so it takes few steps (round-trip replies) to get correct understanding. Therefore, the answerer starts step-by-step; it could be few answerers, everyone is entitled to start. Then the thread initiator decides to go one or another way and approaching his goal gradually, i.e. it's a dialogue already; and then after 2 or 3 steps someone interrupts in the middle of the dialogue. Many people could really get upset.
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>I see, correct observation.
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>On the other hand, I just had an interest in the problem thus jumped in the middle... I really need sometime to be able to pass an opportunity to jump in...

Frankly, I don't see this grid coloring problem as particularly interesting so far. Most likely, search is done with Indexseek(), though we will see.