4048 Problems completed

Since September 8th, 2005 I have completed over 4048 problems:
CT-Art Level 10 x 3 + 96 89% / 85% / 93% / 90%
CT-Art Level 20 x 2 76% / 78%
CT-Art Level 30 x 2 57% / 62%
CT-Art Level 40 x 1 56%
CTS 2500 / 77.8% / rating: 1328

Dutch Indian loss...

I blundered under time pressure in the U1900 OCL 60 15 R2. The opening seems fairly solid. I wonder why it is not played more. 10 e4 made the position more complicated than I could calulate. I also missed 11 ...Bb4.