Sandbagging
Many smart people, with good intentions, have tried, in vain, to prevent sandbagging by choosing the “right” statistics, the “right” mathematics and the “right” match-making methods.  Inevitably, since that fails, they are forced to apply a band aid in the form of handicap police, skill level limit or some other "fix".  The statistics, mathematics and match-making have little or nothing to do with whether or not people sandbag.  It’s about the incentives.
	It is often stated that a certain handicapping system cannot be sandbagged or it is difficult to sandbag.  This is wishful thinking.  Any rating/handicapping system that is based on past performance is vulnerable to sandbagging.  Any new player can play wrong handed for as long as it takes to have a firmly established rating and then switch to his or her other hand.  When you hear someone say a handicapping system is sandbag proof, take it with a grain of salt.
You might have already guessed, I'm working on an idea.  Stay tuned. :grin:
Don