(This interesting text came after the exchange of few e-mail messages between Ian and the editor)
I decided to accept your suggestion that I submit an original problem (a #2) to Mat Plus. But first a preamble on its theme.
For some time now, I've been interested in the Combinative Separation [c.s.] structure - and in developing it further. In particular, I have come to realise that Black Correction and c.s. (of White mates) really belong to a broader concept that I have called "Black Intelligence"; it is a progression that chess players would actually find quite natural. Anyway, the following examples should make this all clear:
Ian Shanahan 8444. Die Schwalbe April 1994 Dedicated to Gerhard Maleika
|
1.Qh5:! (2.Qc5[A],Qd5[B],Qe5[C])
I 1... Ra6: 2.ABC
II 1... f6 2.AB
1... Sac7 2.A C
1... d5 2. BC
III 1... Sb6: 2.A
1... d6 2. B
1... Bb7: 2. C |
Total primary c.s.
|
IV 1... f5 2.Qh8
1... Sb~ 2.c3
|
Fleck-Karlstrom |
V 1... Sc3!? 2.Be3 |
Black Correction |
I-V = 5 levels of progressive Black Intelligence. (The pioneer?)
|
Ian Shanahan C8700. The Problemist September 1994 Dedicated to Barry Barnes
|
Set: 1...fe4/Sb6 2.Qe4:/Se5
1.Qf5:! (2.Qb5[A],Qd5[B],Qe6[C])
I 1... Sb3 2.ABC
II 1... b5 2.AB
1... e6 2.A C
1... a6 2. BC
III 1... Sc4: 2.A
1... b6 2. B
1... e5 2. C |
Total primary c.s. |
IV 1... Sd~ 2.Qc8:
V 1... Sb6!? 2.Sa5: |
Black Correction |
I-V = 5 levels of progressive Black Intelligence. (The second setting?)
|
I then had the idea of weaving in the Dalton theme as well (White unpins a Black unit which then pins the unpinner!) - a nice mixture of 'new(ish)' and 'old'. However, Gerhard Maleika had independently beaten me to it (primary+secondary total c.s. + Dalton theme: 1st Pr "Probleemblad" 1992; quoted in "The Problemist" March 1995). At least I seem to have pioneered the triple blend of total c.s. + Black Correction + Dalton theme **in the original I'm sending you for Mat Plus!** ... which I've been sitting on for a few years, due to the glut of c.s. problems in my usual outlets.
Meanwhile, here is another problem, composed immediately after the abovementioned original, and published in 1995. It is my favourite 2er! ... (admittedly somewhat better than the original I'm sending you).
Ian Shanahan C8872. The Problemist November 1995 Dedicated to A. C. Reeves
|
Set: 1...c4 2.Qc4:
1.Qb5? (2.Qd3[A],Qb1:[B],Qc4[C])
I 1... e5 2.ABC
II 1... Qg6: 2.AB
1... fe2 2.A C
1... c4 2. BC |
Partial primary c.s., incomplete ('imperfect'): no 2. B |
III 1... Sd2 2.A
1... Sb4 2. C |
|
IV 1...Sf4! |
1.Qc5:!* (2.Qc4[C],Qc2[D],Qd4[E])
I 1... f2 2.CDE
II 1... e5 2.CD
1... Sbc3 2.C E
1... Sd2 2. DE |
Total primary c.s., complete ('perfect'); changed c.s. |
III 1... fe2 2.C
1... Qg6: 2. D
1... Sa3 2. E | |
IV 1...Sd~* 2.Qe5 | |
V 1...Sf4!?* 2.Sg3 | Black Correction (Somov mate) |
I-V = 5 levels of progressive Black Intelligence.
* = Dalton theme.
|
Here at last, Milan, is the original - predecessor to the above, and pioneer of the 'triple blend':
Ian Shanahan original
|
Set: 1...d5 2.Se5
1.Qd6:!* (2.Qd4[A],Qd5[B],Se5[C])
I 1... Rb5 2.ABC
II 1... f6 2.AB
1... f5 2.A C
1... Sab3 2. BC |
Total primary c.s. |
III 1... Qc2: 2.A
1... Sc2: 2. B
1... fe6 2. C | |
IV 1...Sc~* 2.Qb4 | |
V 1...Sd3:!?* 2.ed3 | Black Correction |
I-V = 5 levels of progressive Black Intelligence.
* = Dalton theme.
|
|