Walsh style
Walsh Responses to 1C:
with less than 12 HCP
1M - with 4+♦ and 4+♥ or 4+♠ or 4+♥ and 4+♠
with 12 or more HCP
1♦ - with 4+♦ and 4♥ or 4♠ or 4♥ and 4♠
♣ ♦ ♥ ♠
R E F E R E N C E S
Bridgebum
BridgeHands
Wikipedia