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Problem Display

PID: 183603 (8/b1N5/pn1p2r1/Q6b/4k1rn/1N6/K1PB1R2/8 w - - 0 1)

Sparke, Arthur M

British Chess Magazine, 1915

8/b1N5/pn1p2r1/Q6b/4k1rn/1N6/K1PB1R2/8

#2

7 + 9

SOLUTION

SOUND
Sets
- 1...Rg1
  - 2.Rf4#
- 1...Rg2
  - 2.Rf4#
- 1...Rg3
  - 2.Rf4#
- 1...Rf4
  - 2.Rxf4#
- 1...R4g5
  - 2.Rf4#
- 1...Sg2
  - 2.Qf5#
- 1...Sf3
  - 2.Re2#
- 1...Sf5
  - 2.Qxf5#
- 1...Sa4
  - 2.Qd5#
- 1...Sc4
  - 2.Qd5#
- 1...Sd5
  - 2.Qxd5#
- 1...Sd7
  - 2.Qd5#
- 1...Sa8
  - 2.Qd5#
- 1...Sc8
  - 2.Qd5#
Tries
- 1.Qb5?
  - threat
    - 2.Qe2#
  - 1...Sd5
    - 2.Qxd5#
  - 1...Rg1
    - 2.Rf4#
  - 1...Rg2
    - 2.Rf4#
  - 1...Rg3
    - 2.Rf4#
  - 1...Rf4
    - 2.Rxf4#
  - 1...R4g5
    - 2.Rf4#
  - 1...Sg2
    - 2.Qf5#
  - 1...Sf3
    - 2.Re2#
  - 1...Sf5
    - 2.Qxf5#
  - 1...Sa4
    - 2.Qd5#
  - 1...Sc4
    - 2.Qd5#
  - 1...Sd7
    - 2.Qd5#
  - 1...Sa8
    - 2.Qd5#
  - 1...Sc8
    - 2.Qd5#
  - 1...axb5!
- 1.Qc5?
  - threat
    - 2.Qe3#
    - 2.Qd4#
  - 1...Sd5
    - 2.Qxd5#
  - 1...Rg3
    - 2.Rf4#
    - 2.Qd4#
  - 1...Rf4
    - 2.Rxf4#
  - 1...Sg2
    - 2.Qd4#
    - 2.Qf5#
  - 1...Sf3
    - 2.Re2#
  - 1...Sf5
    - 2.Qxf5#
  - 1...Sa4
    - 2.Qd5#
  - 1...Sc4
    - 2.Qd5#
  - 1...Sd7
    - 2.Qd5#
  - 1...Sa8
    - 2.Qd5#
  - 1...Sc8
    - 2.Qd5#
  - 1...dxc5!
Keys
- 1.Bc1!
  - threat
    - 2.Qe1#
  - 1...Sd5
    - 2.Qxd5#
  - 1...Rg1
    - 2.Rf4#
  - 1...Rg2
    - 2.Rf4#
  - 1...Rg3
    - 2.Rf4#
  - 1...Rf4
    - 2.Rxf4#
  - 1...R4g5
    - 2.Rf4#
  - 1...Sg2
    - 2.Qf5#
  - 1...Sf3
    - 2.Re2#
  - 1...Sf5
    - 2.Qxf5#
  - 1...Sa4
    - 2.Qd5#
  - 1...Sc4
    - 2.Qd5#
  - 1...Sd7
    - 2.Qd5#
  - 1...Sa8
    - 2.Qd5#
  - 1...Sc8
    - 2.Qd5#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 0
Sets
- R(b);N_GUARD::R1(D)
- R(b);N_GUARD::R1(D),XR(b)
- S(c);N_GUARD::QAB1(F)
- S(c);SBLOCK::R(D)
- S(c);N_GUARD::QAB1(F),XS(c)
- S(f);N_GUARD::QAB1(F)
- S(f);N_GUARD::QAB1(F),XS(f)
Tries
- Try
  - Q(F);
  - Threat
    - QAR2(F)
  - Vars
    - S(f);N_GUARD::QAB1(F),XS(f)
    - R(b);N_GUARD::R1(D)
    - R(b);N_GUARD::R1(D),XR(b)
    - S(c);N_GUARD::QAB1(F)
    - S(c);SBLOCK::R(D)
    - S(c);N_GUARD::QAB1(F),XS(c)
    - S(f);N_GUARD::QAB1(F)
  - Refutation
    - P(e);XQ(F)
- Try
  - Q(F);
  - Threat
    - DUALS(2)
  - Vars
    - S(f);N_GUARD::QAB1(F),XS(f)
    - R(b);N_GUARD::R1(D),XR(b)
    - S(c);SBLOCK::R(D)
    - S(c);N_GUARD::QAB1(F),XS(c)
    - S(f);N_GUARD::QAB1(F)
  - Refutation
    - P(g);XQ(F)
Actual
- B(C);
- Threat
  - QAR(F)
- Vars
  - S(f);N_GUARD::QAB1(F),XS(f)
  - R(b);N_GUARD::R1(D)
  - R(b);N_GUARD::R1(D),XR(b)
  - S(c);N_GUARD::QAB1(F)
  - S(c);SBLOCK::R(D)
  - S(c);N_GUARD::QAB1(F),XS(c)
  - S(f);N_GUARD::QAB1(F)

Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).