MESON Chess Problem Database

Problem Display
PID: 87750 (1n4n1/2Qp3b/1pq5/B7/N5N1/7R/2k3B1/R6K w - - 0 1)

Reilly, William Henry

The Problemist, 1931

1n4n1/2Qp3b/1pq5/B7/N5N1/7R/2k3B1/R6K

#2

8 + 7

6490 yacpdb 2009
5454 Near Snap 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Qc3
      • 2.Qxc3#
    • 1...Qc4
      • 2.Qxc4#
    • 1...Be4
      • 2.Bxe4#
  • Tries
    • 1.Bxc6?
      • threat
        • 2.Be4#
        • 2.Qh2#
      • 1...Be4+
        • 2.Bxe4#
      • 1...Sxc6
        • 2.Qh2#
      • 1...bxa5
        • 2.Qh2#
      • 1...dxc6
        • 2.Qh2#
        • 2.Qxh7#
      • 1...d5
        • 2.Qh2#
        • 2.Qxh7#
      • 1...d6
        • 2.Be4#
        • 2.Qxh7#
      • 1...Bd3!
    • 1.Rha3?
      • threat
        • 2.Se3#
      • 1...Qc3
        • 2.Qxc3#
      • 1...bxa5!
    • 1.Rc3+?
      • 1...Qxc3
        • 2.Qxc3#
      • 1...Kd2!
  • Keys
    • 1.Bd5!
      • threat
        • 2.Qh2#
      • 1...Be4+
        • 2.Bxe4#
      • 1...Qxc7
        • 2.Bb3#
      • 1...Qc3
        • 2.Qxc3#
      • 1...Qc4
        • 2.Qxc4#
      • 1...Qc5
        • 2.Bb3#
      • 1...Bd3
        • 2.Se3#
      • 1...d6
        • 2.Qxh7#

Anticipated by 32400(1928)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(c);N_PINB(C),OGATE::QAR1(H),XQ(c)
    • Q(c);N_PINB(C),OGATE::QAR2(H),XQ(c)
    • B(e);N_GUARD::B(C),XB(e)
  • Tries
    • Try
      • B(C);N_SPINB(C),XQ(c)
      • Threat
        • DUALS(2)
      • Vars
        • B(e);CHECK::QAR(H)+B(C),DCHECK,XB(e)
        • S(f);P_SPINS(f),XB(C)::QAR(H)
        • P(b);XB(G)::QAR(H)
      • Refutation
        • B(e);
    • Try
      • R(D);
      • Threat
        • S(F)
      • Vars
        • Q(c);N_PINB(C),OGATE::QAR1(H),XQ(c)
      • Refutation
        • P(b);XB(G)
    • Try
      • R(D);CHECK,N_PINQ(c)
      • Vars
        • Q(c);N_PINB(C),OGATE,P_SPINQ(c),XR(D)::QAR1(H),XQ(c)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • B(C);
    • Threat
      • QAR(H)
    • Vars
      • B(e);CHECK,N_GUARD,N_PINB(C)::B(C),XB(e)
      • Q(c);N_PINB(C),N_SPINQ(c),XQ(H)::B(C)
      • Q(c);N_PINB(C),OGATE::QAR1(H),XQ(c)
      • Q(c);N_PINB(C),OGATE::QAR2(H),XQ(c)
      • Q(c);N_PINB(C)::B(C)
      • B(e);SBLOCK::S(F)
      • P(d);OGATE::QAB(H),XB(e)
HTML5 logo

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).