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Problem Display

PID: 146665 (3r4/2R5/qB2B3/2P2p2/1pPk1pNn/8/4PN1b/2R2K1Q w - - 0 1)

Whitehead, Cyril

Australian Chess Problem Magazine, 1992

3r4/2R5/qB2B3/2P2p2/1pPk1pNn/8/4PN1b/2R2K1Q

#2

11 + 8

SOLUTION

SOUND
Sets
- 1...Qxc4
  - 2.Rxc4#
- 1...Qc8
  - 2.c6#
- 1...Qa1
  - 2.c6#
- 1...Qa2
  - 2.c6#
- 1...Qa3
  - 2.c6#
- 1...Qa4
  - 2.c6#
- 1...Qa8
  - 2.c6#
- 1...Rd5
  - 2.Qxd5#
- 1...Rd7
  - 2.Rxd7#
- 1...Ra8
  - 2.Rd7#
  - 2.Qd5#
- 1...Rb8
  - 2.Rd7#
  - 2.Qd5#
- 1...Rc8
  - 2.Rd7#
  - 2.Qd5#
- 1...Re8
  - 2.Rd7#
  - 2.Qd5#
- 1...Rf8
  - 2.Rd7#
  - 2.Qd5#
- 1...Rg8
  - 2.Rd7#
  - 2.Qd5#
- 1...Rh8
  - 2.Rd7#
  - 2.Qd5#
- 1...f3
  - 2.e3#
- 1...fxg4
  - 2.Qe4#
Tries
- 1.Qf3?
  - threat
    - 2.Rd1#
    - 2.Qd3#
  - 1...Qxc4
    - 2.Rxc4#
  - 1...fxg4
    - 2.Qe4#
  - 1...Qa1
    - 2.Qd3#
    - 2.c6#
  - 1...Qa2
    - 2.Qd3#
    - 2.c6#
  - 1...Qa3
    - 2.c6#
  - 1...Qa4
    - 2.Qd3#
    - 2.c6#
  - 1...Rd5
    - 2.Qxd5#
    - 2.Qd3#
  - 1...Sxf3!
Keys
- 1.Qa8!
  - threat
    - 2.Qxd8#
  - 1...Qxc4
    - 2.Rxc4#
  - 1...Qxb6
    - 2.Qa1#
  - 1...Qxa8
    - 2.c6#
  - 1...Rxa8
    - 2.Rd7#
  - 1...fxg4
    - 2.Qe4#
  - 1...Qb5
    - 2.Qa1#
  - 1...Qb7
    - 2.Qa1#
  - 1...Qc8
    - 2.Qa1#
    - 2.c6#
  - 1...Qa4
    - 2.c6#
  - 1...Rd5
    - 2.Qxd5#
  - 1...Rd6
    - 2.Qh8#
  - 1...Rd7
    - 2.Rxd7#
  - 1...Rb8
    - 2.Rd7#
    - 2.Qd5#
  - 1...Rc8
    - 2.Rd7#
    - 2.Qd5#
  - 1...Re8
    - 2.Rd7#
    - 2.Qd5#
  - 1...Rf8
    - 2.Rd7#
    - 2.Qd5#
  - 1...Rg8
    - 2.Rd7#
    - 2.Qd5#
  - 1...Rh8
    - 2.Rd7#
    - 2.Qd5#
    - 2.Qxh8#
  - 1...f3
    - 2.e3#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 5
- REMOVED MATES = 4
Sets
- Q(g);OGATE,P_PINP(D),XP(F)::R1(A),XQ(g)
- Q(g);N_GUARD::B(I)+P(H)
- Q(g);N_GUARD,P_PINR(A)::B(I)+P(H)
- R(h);N_GUARD::QAR1(C),XR(h)
- R(h);N_GUARD::R(K),XR(h)
- P(d);N_GUARD::P(D)
- P(f);N_GUARD,XS(G)::QAR1(C)
Tries
- Try
  - Q(C);
  - Threat
    - DUALS(2)
  - Vars
    - Q(g);OGATE,P_PINP(D),XP(F)::R1(A),XQ(g)
    - P(f);N_GUARD,XS(G)::QAR1(C)
    - Q(g);N_GUARD::B(I)+P(H)
  - Refutation
    - S(e);XQ(C)
Actual
- Q(C);
- Threat
  - QAR(C),XR(h)
- Vars
  - Q(g);OGATE,P_PINP(D),XP(F)::R1(A),XQ(g)
  - Q(g);OGATE,XB(I)::QAB(C)
  - Q(g);N_GUARD,XQ(C)::B(I)+P(H)
  - R(h);N_GUARD,XQ(C)::R(K)
  - P(f);N_GUARD,XS(G)::QAR1(C)
  - Q(g);OGATE::QAB(C)
  - Q(g);N_GUARD::B(I)+P(H)
  - R(h);N_GUARD::QAR1(C),XR(h)
  - R(h);OGATE::QAB(C)
  - R(h);N_GUARD::R(K),XR(h)
  - P(d);N_GUARD::P(D)

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).