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Problem Display

PID: 168994 (8/8/1K3N2/1N6/2k4B/Q7/2r5/8 w - - 0 1)

Lincoln, Robert A

SuperProblem, 2017

8/8/1K3N2/1N6/2k4B/Q7/2r5/8

#2

5 + 2

6490	yacpdb	2018

SOLUTION

SOUND
Sets
- 1...Ra2
  - 2.Qc3#
- 1...Rb2
  - 2.Qc3#
- 1...Rd2
  - 2.Qc3#
- 1...Re2
  - 2.Qc3#
- 1...Rf2
  - 2.Qc3#
- 1...Rg2
  - 2.Qc3#
- 1...Rh2
  - 2.Qc3#
- 1...Rc3
  - 2.Qxc3#
Tries
- 1.Kc6?
  - 1...Rc3
    - 2.Qxc3#
  - 1...Ra2
    - 2.Qc3#
  - 1...Rb2
    - 2.Qc3#
  - 1...Rd2
    - 2.Qc3#
  - 1...Re2
    - 2.Qc3#
  - 1...Rf2
    - 2.Qc3#
  - 1...Rg2
    - 2.Qc3#
  - 1...Rh2
    - 2.Qc3#
  - 1...Rc1!
- 1.Be1?
  - 1...Rc3
    - 2.Qxc3#
  - 1...Ra2
    - 2.Qc3#
  - 1...Rb2
    - 2.Qc3#
  - 1...Rd2
    - 2.Qc3#
  - 1...Re2
    - 2.Qc3#
  - 1...Rf2
    - 2.Qc3#
  - 1...Rg2
    - 2.Qc3#
  - 1...Rh2
    - 2.Qc3#
  - 1...Rc1!
- 1.Bg3?
  - 1...Rc3
    - 2.Qxc3#
  - 1...Ra2
    - 2.Qc3#
  - 1...Rb2
    - 2.Qc3#
  - 1...Rd2
    - 2.Qc3#
  - 1...Re2
    - 2.Qc3#
  - 1...Rf2
    - 2.Qc3#
  - 1...Rg2
    - 2.Qc3#
  - 1...Rh2
    - 2.Qc3#
  - 1...Rc1!
- 1.Bg5?
  - 1...Rc3
    - 2.Qxc3#
  - 1...Ra2
    - 2.Qc3#
  - 1...Rb2
    - 2.Qc3#
  - 1...Rd2
    - 2.Qc3#
  - 1...Re2
    - 2.Qc3#
  - 1...Rf2
    - 2.Qc3#
  - 1...Rg2
    - 2.Qc3#
  - 1...Rh2
    - 2.Qc3#
  - 1...Rc1!
Keys
- 1.Bf2!
  - threat
    - 2.Sd6#
  - 1...Rxf2
    - 2.Qc3#
  - 1...Rc3
    - 2.Qxc3#
  - 1...Rb2
    - 2.Qc3#
  - 1...Rd2
    - 2.Qc3#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 4
Sets
- R(a);N_GUARD::QAR1(A)
- R(a);N_GUARD,P_PINS(C)::QAR1(A)
- R(a);N_GUARD::QAR1(A),XR(a)
Tries
- Try
  - K(D);P-FLIGHT
  - Vars
    - R(a);N_GUARD::QAR1(A),XR(a)
    - R(a);N_GUARD::QAR1(A)
  - Refutation
    - R(a);
- Try
  - B(B);
  - Vars
    - R(a);N_GUARD::QAR1(A),XR(a)
    - R(a);N_GUARD::QAR1(A)
    - R(a);N_GUARD,P_PINS(C)::QAR1(A)
  - Refutation
    - R(a);
- Try
  - B(B);
  - Vars
    - R(a);N_GUARD::QAR1(A),XR(a)
    - R(a);N_GUARD::QAR1(A)
    - R(a);N_GUARD,P_PINS(C)::QAR1(A)
  - Refutation
    - R(a);
- Try
  - B(B);
  - Vars
    - R(a);N_GUARD::QAR1(A),XR(a)
    - R(a);N_GUARD::QAR1(A)
    - R(a);N_GUARD,P_PINS(C)::QAR1(A)
  - Refutation
    - R(a);
Actual
- B(B);
- Threat
  - S(C)
- Vars
  - R(a);N_GUARD,XB(B)::QAR1(A)
  - R(a);N_GUARD::QAR1(A),XR(a)
  - R(a);N_GUARD,P_PINS(C)::QAR1(A)
  - R(a);N_GUARD::QAR1(A)

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).