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Problem Display

PID: 143142 (1RBB4/N1KPQ3/2p5/kbr5/p7/p2P4/P2P4/8 w - - 0 1)

Shire, David J

The Problemist Supplement, 2011

1RBB4/N1KPQ3/2p5/kbr5/p7/p2P4/P2P4/8

#2

10 + 6

SOLUTION

SOUND
Sets
- 1...Kb4
  - 2.Sxc6#
- 1...Rc1
  - 2.Kb7#
- 1...Rc2
  - 2.Kb7#
- 1...Rc3
  - 2.Kb7#
- 1...Rc4
  - 2.Kb7#
- 1...Rd5
  - 2.Kb7#
- 1...Re5
  - 2.Kb7#
- 1...Rf5
  - 2.Kb7#
- 1...Rg5
  - 2.Kb7#
- 1...Rh5
  - 2.Kb7#
- 1...Bxd3
  - 2.Kd6#
- 1...Bc4
  - 2.Kd6#
- 1...Ba6
  - 2.Kd6#
Tries
- 1.Sxc6+?
  - 1...Bxc6
    - 2.Kd6#
  - 1...Rxc6+!
- 1.Rxb5+?
  - 1...Rxb5
    - 2.Sxc6#
  - 1...cxb5+!
- 1.Qh4?
  - threat
    - 2.Kd6#
    - 2.Kb7#
  - 1...Rd5
    - 2.Kb7#
  - 1...Bc4
    - 2.Kd6#
  - 1...Ba6
    - 2.Kd6#
    - 2.Qb4#
  - 1...Rc4!
- 1.Qe4?
  - threat
    - 2.Kd6#
    - 2.Kb7#
  - 1...Rd5
    - 2.Kb7#
  - 1...Bc4
    - 2.Kd6#
  - 1...Ba6
    - 2.Kd6#
    - 2.Qb4#
  - 1...Rc4!
- 1.d4?
  - 1...Rc1
    - 2.Kb7#
  - 1...Rc2
    - 2.Kb7#
  - 1...Rc3
    - 2.Kb7#
  - 1...Rc4
    - 2.Kb7#
  - 1...Rd5
    - 2.Kb7#
  - 1...Re5
    - 2.Kb7#
  - 1...Rf5
    - 2.Kb7#
  - 1...Rg5
    - 2.Kb7#
  - 1...Rh5
    - 2.Kb7#
  - 1...Bf1
    - 2.Kd6#
  - 1...Be2
    - 2.Kd6#
  - 1...Bd3
    - 2.Kd6#
  - 1...Bc4
    - 2.Kd6#
  - 1...Ba6
    - 2.Kd6#
  - 1...Kb4!
Keys
- 1.Qf8!
  - 1...Kb4
    - 2.Sxc6#
  - 1...Bxd3
    - 2.Kd6#
  - 1...Rc1
    - 2.Kb7#
  - 1...Rc2
    - 2.Kb7#
  - 1...Rc3
    - 2.Kb7#
  - 1...Rc4
    - 2.Kb7#
  - 1...Rd5
    - 2.Kb7#
  - 1...Re5
    - 2.Kb7#
  - 1...Rf5
    - 2.Kb7#
  - 1...Rg5
    - 2.Kb7#
  - 1...Rh5
    - 2.Kb7#
  - 1...Bc4
    - 2.Kd6#
  - 1...Ba6
    - 2.Kd6#

This is a version of 371

FEATURES

Static
- TYPE = WAITER
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 0
Sets
- K(c);P_SPINB(d),P_SPINR(e),S_FLIGHT::S(D),XP(f)
- R(e);::B(J)+K(E)
- R(e);SBLOCK::B(J)+K(E)
- B(d);XP(C)::B(J)+K(E)
- B(d);::B(J)+K(E)
Tries
- Try
  - S(D);CHECK,P_SPINS(D),XP(f)
  - Vars
    - B(d);XS(D)::B(J)+K(E)
  - Refutation
    - R(e);CHECK,XS(D)
- Try
  - R(H);CHECK,XB(d)
  - Vars
    - R(e);SBLOCK,XR(H)::S(D),XP(f)
  - Refutation
    - P(f);CHECK,XR(H)
- Try
  - Q(G);
  - Threat
    - DUALS(2)
  - Vars
    - R(e);::B(J)+K(E)
    - B(d);::B(J)+K(E)
  - Refutation
    - R(e);
- Try
  - Q(G);
  - Threat
    - DUALS(2)
  - Vars
    - R(e);::B(J)+K(E)
    - B(d);::B(J)+K(E)
  - Refutation
    - R(e);
- Try
  - P(C);
  - Vars
    - R(e);::B(J)+K(E)
    - R(e);SBLOCK::B(J)+K(E)
    - B(d);::B(J)+K(E)
  - Refutation
    - K(c);P_SPINB(d),P_SPINR(e),S_FLIGHT
Actual
- Q(G);
- Vars
  - K(c);P_SPINB(d),P_SPINR(e),S_FLIGHT::S(D),XP(f)
  - B(d);XP(C)::B(J)+K(E)
  - R(e);::B(J)+K(E)
  - R(e);SBLOCK::B(J)+K(E)
  - B(d);::B(J)+K(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).