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Problem Display

PID: 12403 (KbBB4/p7/7p/8/r2nQp2/2N3k1/4P1qr/3N2R1 w - - 0 1)

Lender, Baruch

1st Comm., Verdonk MT, 1978

KbBB4/p7/7p/8/r2nQp2/2N3k1/4P1qr/3N2R1

#2

8 + 9

SOLUTION

SOUND
Sets
- 1...Qxg1
  - 2.Qg6#
- 1...Rh1
  - 2.Rxg2#
  - 2.Qxg2#
- 1...Rh3
  - 2.Rxg2#
  - 2.Qxg2#
- 1...Rh4
  - 2.Rxg2#
  - 2.Qxg2#
- 1...Rh5
  - 2.Rxg2#
  - 2.Qxg2#
- 1...Sc2
  - 2.Qf3#
- 1...Sxe2
  - 2.Sxe2#
- 1...Sb3
  - 2.Qf3#
- 1...Sf3
  - 2.Qxf3#
- 1...Sb5
  - 2.Qf3#
- 1...Sf5
  - 2.Qf3#
- 1...Sc6
  - 2.Qf3#
  - 2.Qg6#
- 1...Se6
  - 2.Qf3#
- 1...f3
  - 2.Qg4#
Tries
- 1.Bh4+?
  - 1...Rxh4
    - 2.Rxg2#
    - 2.Qxg2#
  - 1...Kxh4!
- 1.Qd5?
  - threat
    - 2.Se4#
  - 1...Qxg1
    - 2.Qg8#
  - 1...Sxe2
    - 2.Sxe2#
  - 1...Rh1
    - 2.Rxg2#
    - 2.Qxg2#
  - 1...Rh3
    - 2.Rxg2#
    - 2.Qxg2#
  - 1...Rh4
    - 2.Rxg2#
    - 2.Qxg2#
  - 1...Rh5
    - 2.Rxg2#
    - 2.Qxg2#
  - 1...Sf5
    - 2.Qf3#
  - 1...Se6
    - 2.Qf3#
  - 1...Sc2
    - 2.Qf3#
  - 1...Sb3
    - 2.Qf3#
  - 1...Sf3
    - 2.Qxf3#
  - 1...Sb5
    - 2.Qf3#
  - 1...Sc6
    - 2.Qf3#
    - 2.Qg8#
  - 1...f3!
Keys
- 1.Qb7!
  - threat
    - 2.Se4#
  - 1...Qxg1
    - 2.Qg7#
  - 1...Sxe2
    - 2.Sxe2#
  - 1...Rh1
    - 2.Rxg2#
    - 2.Qxg2#
  - 1...Rh3
    - 2.Rxg2#
    - 2.Qxg2#
  - 1...Rh4
    - 2.Rxg2#
    - 2.Qxg2#
  - 1...Rh5
    - 2.Rxg2#
    - 2.Qxg2#
  - 1...Sf5
    - 2.Qf3#
  - 1...Se6
    - 2.Qf3#
  - 1...f3
    - 2.Qxb8#
  - 1...Sc2
    - 2.Qf3#
  - 1...Sb3
    - 2.Qf3#
  - 1...Sf3
    - 2.Qxf3#
  - 1...Sb5
    - 2.Qf3#
  - 1...Sc6
    - 2.Qg7#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 2
- ADDED MATES = 1
- REMOVED MATES = 0
Sets
- Q(a);N_PINQ(E),N_SPINQ(a),XR(B)::QAR(E)
- S(e);N_GUARD::QAR1(E)
- S(e);XP(C)::S(D),XS(e)
- S(e);N_GUARD,N_PINQ(E)::QAR1(E),XS(e)
- P(f);N_PINQ(E)::QAR1(E)
Tries
- Try
  - B(H);CHECK
  - Refutation
    - K(c);N_SPINQ(a),P_SPINP(f),S_FLIGHT,XB(H)
- Try
  - Q(E);
  - Threat
    - S(D)
  - Vars
    - Q(a);N_PINQ(E),N_SPINQ(a),XR(B)::QAR(E)
    - S(e);XP(C)::S(D),XS(e)
    - S(e);N_GUARD::QAR1(E)
    - S(e);N_GUARD,N_PINQ(E)::QAR1(E),XS(e)
  - Refutation
    - P(f);N_PINQ(E)
Actual
- Q(E);
- Threat
  - S(D)
- Vars
  - Q(a);N_PINQ(E),N_SPINQ(a),XR(B)::QAR(E)
  - S(e);XP(C)::S(D),XS(e)
  - S(e);N_GUARD::QAR1(E)
  - P(f);N_PINQ(E)::QAB(E),XB(i)
  - S(e);N_GUARD,N_PINQ(E)::QAR1(E),XS(e)
  - S(e);N_PINQ(E)::QAR(E)

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).