Good bid, bad play

[slar]

http://www.bridgebase.com/tools/handviewer.html?bbo=y&lin=st||md|4SA2HATD753CA97632,SKT54H65DA8642CQT,S86HKQ842DKT9CK84,SQJ973HJ973DQJCJ5|sv|E|ah|Board%206|mb|P|mb|1C|an|Minor%20suit%20opening%20--%203+%20!C;%2011-21%20HCP;%2012-22%20total%20points|mb|1D|an|One-level%20overcall%20--%205+%20!D;%208-17%20HCP;%209-19%20total%20points|mb|1H|an|Free%20bid%20--%204+%20!H;%206+%20total%20points;%20forcing|mb|1S|an|4-%20!D;%205+%20!S;%2011-%20HCP;%207-12%20total%20points|mb|2C|an|Opener%20rebids%20his%20C%20--%202-%20!H;%203-%20!S;%2011-15%20HCP;%20twice%20rebiddable%20!C;%2012-16%20total%20points|mb|3S|an|5+%20!D;%204+%20!S;%208+%20HCP;%209-14%20total%20points|mb|D|an|4+%20!H;%2012+%20HCP;%2013+%20total%20points;%20forcing|mb|P|mb|P|mb|P|pc|HA|pc|H5|pc|H4|pc|H3|pc|C6|pc|CT|pc|CK|pc|C5|pc|HK|pc|H9|pc|HT|pc|H6|pc|D9|pc|DQ|pc|D3|pc|D6|pc|S9|pc|SA|pc|S4|pc|S6|pc|CA|pc|CQ|pc|C8|pc|CJ|pc|D5|pc|DA|pc|DT|pc|DJ|pc|ST|pc|S8|pc|S3|pc|S2|pc|D4|pc|DK|pc|SJ|pc|D7|pc|H7|pc|C2|pc|S5|pc|H8|pc|D8|pc|H2|pc|HJ|pc|C3|pc|D2|pc|C4|pc|SQ|pc|C7|pc|S7|pc|C9|pc|SK|pc|HQ|

 

I really like GIB's double here. Too bad it followed up with an inexplicable play on trick 4. Playing a diamond there can only cost a trick. Any other suit would have been better.