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Problem Display

PID: 271880 (3Q4/8/3n4/1p1k1p2/1P1P1P2/prRKRrp1/P5P1/3N4 w - - 0 1)

Jackson, GBH

Sunday Referee, 1933

(First published on Sun Dec 24 1933)

3Q4/8/3n4/1p1k1p2/1P1P1P2/prRKRrp1/P5P1/3N4

#2

10 + 8

15239	Valois Notebooks	2023

SOLUTION

SOUND
Sets
- 1...Rb1
  - 2.Rc5#
- 1...Rb2
  - 2.Rc5#
- 1...Rxb4
  - 2.Rc5#
- 1...Rf1
  - 2.Re5#
- 1...Rf2
  - 2.Re5#
- 1...Rxf4
  - 2.Re5#
Tries
- 1.Qb6?
  - threat
    - 2.Qc5#
    - 2.Qc6#
  - 1...Rxc3+
    - 2.Sxc3#
  - 1...Sc4
    - 2.Qc5#
    - 2.Qe6#
  - 1...Se4
    - 2.Qc6#
  - 1...Sb7
    - 2.Qc6#
    - 2.Qe6#
  - 1...Rxe3+!
- 1.Qf6?
  - threat
    - 2.Qe5#
    - 2.Qe6#
  - 1...Rxe3+
    - 2.Sxe3#
  - 1...Sc4
    - 2.Qe6#
  - 1...Se4
    - 2.Qe5#
    - 2.Qc6#
  - 1...Sf7
    - 2.Qc6#
    - 2.Qe6#
  - 1...Rxc3+!
- 1.Qc7?
  - threat
    - 2.Qc5#
    - 2.Qc6#
  - 1...Rxc3+
    - 2.Sxc3#
  - 1...Se4
    - 2.Qe5#
    - 2.Qc6#
  - 1...Sc4
    - 2.Qc5#
  - 1...Sb7
    - 2.Qe5#
    - 2.Qc6#
  - 1...Rxe3+!
- 1.Qe7?
  - threat
    - 2.Qe5#
    - 2.Qe6#
  - 1...Rxe3+
    - 2.Sxe3#
  - 1...Sc4
    - 2.Qc5#
    - 2.Qe6#
  - 1...Se4
    - 2.Qe5#
  - 1...Sf7
    - 2.Qc5#
    - 2.Qe6#
  - 1...Rxc3+!
- 1.Qc8?
  - threat
    - 2.Qe6#
    - 2.Qc5#
    - 2.Qc6#
  - 1...Rxc3+
    - 2.Sxc3#
  - 1...Rxe3+
    - 2.Sxe3#
  - 1...Sc4
    - 2.Qe6#
    - 2.Qc5#
  - 1...Se4
    - 2.Qc6#
  - 1...Sb7
    - 2.Qe6#
    - 2.Qc6#
  - 1...Sxc8!
- 1.Qe8?
  - threat
    - 2.Qc6#
    - 2.Qe5#
    - 2.Qe6#
  - 1...Rxc3+
    - 2.Sxc3#
  - 1...Rxe3+
    - 2.Sxe3#
  - 1...Sc4
    - 2.Qe6#
  - 1...Se4
    - 2.Qc6#
    - 2.Qe5#
  - 1...Sf7
    - 2.Qc6#
    - 2.Qe6#
  - 1...Sxe8!
Keys
- 1.Qd7!
  - threat
    - 2.Qc6#
    - 2.Qe6#
  - 1...Rxc3+
    - 2.Sxc3#
  - 1...Rxe3+
    - 2.Sxe3#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 6
Sets
- R(b);N_PINR(D),P_PINR(F)::R1(D)
- R(b);N_PINR(D),P_PINR(F),XP(G)::R1(D)
- R(c);OGATE::R1(F)
- R(c);OGATE,XP(I)::R1(F)
Tries
- Try
  - Q(J);N_PINS(h)
  - Threat
    - DUALS(2)
  - Vars
    - R(b);CHECK,P_PINR(F),XR(D)::S(A),XR(b)
    - S(h);::QAB1(J)
  - Refutation
    - R(c);CHECK,XR(F)
- Try
  - Q(J);N_PINS(h)
  - Threat
    - DUALS(2)
  - Vars
    - R(c);CHECK,XR(F)::S(A),XR(c)
    - S(h);::QAB1(J)
  - Refutation
    - R(b);CHECK,P_PINR(F),XR(D)
- Try
  - Q(J);N_PINS(h)
  - Threat
    - DUALS(2)
  - Vars
    - R(b);CHECK,P_PINR(F),XR(D)::S(A),XR(b)
    - S(h);::QAR1(J)
  - Refutation
    - R(c);CHECK,XR(F)
- Try
  - Q(J);N_PINS(h)
  - Threat
    - DUALS(2)
  - Vars
    - R(c);CHECK,XR(F)::S(A),XR(c)
    - S(h);::QAR1(J)
  - Refutation
    - R(b);CHECK,P_PINR(F),XR(D)
- Try
  - Q(J);N_PINS(h)
  - Threat
    - DUALS(3)
  - Vars
    - R(b);CHECK,P_PINR(F),XR(D)::S(A),XR(b)
    - R(c);CHECK,XR(F)::S(A),XR(c)
    - S(h);::QAB1(J)
  - Refutation
    - S(h);XQ(J)
- Try
  - Q(J);N_PINS(h)
  - Threat
    - DUALS(3)
  - Vars
    - R(b);CHECK,P_PINR(F),XR(D)::S(A),XR(b)
    - R(c);CHECK,XR(F)::S(A),XR(c)
    - S(h);::QAB1(J)
  - Refutation
    - S(h);XQ(J)
Actual
- Q(J);
- Threat
  - DUALS(2)
- Vars
  - R(b);CHECK,P_PINR(F),XR(D)::S(A),XR(b)
  - R(c);CHECK,XR(F)::S(A),XR(c)

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).