IMP/Precision/T-Precision/1C-responseについて、ここに記述してください。
http://transferprecision.blogspot.com/2011/06/advantages-of-transfer-system-of.html
Advantages of a Transfer System of Responses to a Precision 1C
1♦ is the negative response.
2♥/2♠ are constructuve responses showing a 6 card suit short of making a positive response(5-8 HCP).
1♥ is a transfer to spades with at least a 4 card suit. 1♠ shows at least a 4 card heart suit.
1NT is a transfer to clubs showing at least a 5 card suit.
2C is a transfer to diamonds showing at least a 5 card suit.