+---+---+---+---+---+---+---+---+---+---+
| 2 | * | 1 | | * | 2 | * | | 1 | |
+---+---+---+---+---+---+---+---+---+---+
| * | | | 2 | | | 2 | | * | 1 |
+---+---+---+---+---+---+---+---+---+---+
| | 2 | | 1 | * | 1 | | * | 3 | |
+---+---+---+---+---+---+---+---+---+---+
| 1 | * | | 2 | | | | 2 | * | |
+---+---+---+---+---+---+---+---+---+---+
| | 2 | | * | 2 | 1 | | | 2 | * |
+---+---+---+---+---+---+---+---+---+---+
| 1 | * | 2 | 1 | | * | 2 | 1 | 2 | |
+---+---+---+---+---+---+---+---+---+---+
| | | | | | 3 | * | | 2 | * |
+---+---+---+---+---+---+---+---+---+---+
| | 2 | * | 2 | * | | | 3 | * | |
+---+---+---+---+---+---+---+---+---+---+
| * | 2 | | 3 | | 2 | * | 2 | | 2 |
+---+---+---+---+---+---+---+---+---+---+
| 1 | | 1 | * | | | | | | * |
+---+---+---+---+---+---+---+---+---+---+
The diamonds in DS and GT indicate blanks in DT, FT and HT.
As there is already a diamond in DS, there must be another one in either ER or ET (to satisfy the 2 in ES).
The 2 in FS has an adjacent diamond in GT and because the other one is in either ER or ET, then GR must be blank. This means that HS must feature a diamond (because of the 2 in GS)and IS must be blank.
The 3 in HR means that GQ and IQ must feature diamonds and HQ and JQ must be blank. As the 2 in IR now has two adjacent diamonds, JR and JS must be blank and JT must bear a diamond (because of the 2 in IT).Since there is a diamond in GQ, EQ and ER must be blank and ET must have a diamond to satisfy the 2 in ES.
The 2 in FQ now indicates a diamond in FP, which make FO, DO, DP and DQ blank. The 2 in EO now indicates a diamond in EN, whick make EM, GM, GN and GO blank.
The 3 in GP means that either HO or HP contains a diamond, so, IO, JO and JP are blank (because of the 2 in IP).
The 2 in HN indicates a diamond in HO, which makes HP blank. The 3 in IN places a diamond in JN and because of the 1 in JM, JL and IM are blank, which places a diamond in HM.
Now that the 2 in HL has two adjacent diamonds, GK and GL must be blank.
The 2 in FM indicates a diamond in FL, making EK blank.
The 2 in AK places diamonds in BK and AL; and blanks in BL and CK. The 1 in DK places a diamond in DL and a blank in DM. The diamond in AL makes BM and AN blank (because of the 1 in AM).
The diamonds in BK and DL (because of the 2 in CL) make CM blank. The only two cells which can satisfy the demand of the 2 in BN are AO and CO, making BO blank.
The 1 in CP makes BP and CQ blank. The only place left to satisfy the 2 in AP is AQ, making AR blank. The only place left to satisfy the 2 in DR is CR, making BR blank.
The 3 in CS requires a diamond in either BS or CT, making AT blank. To satisfy the 1 in AS, BS must have a diamond and CT must be blank.
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