Interesting proposal, but it creates massive incentive to glide home over that last unlandable forest no matter what altitude. Everyone landing out 5 km short on last good landing place, one tries risky glide home and scores extra 250 points. Current formula gives risk taker only small benefit.
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I believe this is only true if practically everyone lands out and you are the sole finisher. The more common case is you are (or believe you may be since you don't have perfect information) one of a few landouts. In Sean's example landing out cost him nearly 700 points. In general IGC rules are much harsher on outlandings than US rules which are harsher on outlandings than John's proposal (most of the time except in the case of a distance day with near 100% landouts). You are really describing only the case of the one guy who manages to get close to home on a difficult day where IGC rules say "don't bother".

Having looked at the issue of marginal glides home and scoring quite a lot I've concluded that most pilots, if they get within a marginal glide from home, will go for it - for reasons unrelated to points. A landout and retreive is a significant risk and hassle all by itself.

Andy Blackburn
9B