MESON Chess Problem Database

Problem Display
PID: 54166 (3n2Q1/8/1b5p/2RP4/1p1k1B2/Nq1P4/3R2K1/8 w - - 0 1)

MacKay, JC

Chess Life, 1956

3n2Q1/8/1b5p/2RP4/1p1k1B2/Nq1P4/3R2K1/8

#2

8 + 6

3713 Snap 2005

SOLUTION

  • SOUND
  • Sets
    • 1...Kxc5
      • 2.d4#
    • 1...Qd1
      • 2.Rc4#
    • 1...Qa4
      • 2.Rc4#
    • 1...Qc4
      • 2.Rxc4#
    • 1...Qxd5+
      • 2.Qxd5#
    • 1...Qb1
      • 2.Rc4#
    • 1...Qb2
      • 2.Rc4#
    • 1...Qxa3
      • 2.Rc4#
    • 1...Qxd3
      • 2.Rc4#
    • 1...Bxc5
      • 2.Sb5#
  • Tries
    • 1.Qe6?
      • threat
        • 2.Be3#
        • 2.Qe3#
      • 1...Qxd5+
        • 2.Qxd5#
      • 1...Kxc5
        • 2.Be3#
        • 2.d4#
      • 1...Bxc5
        • 2.Sb5#
        • 2.Qe5#
      • 1...Qc4
        • 2.Rxc4#
      • 1...Sxe6!
    • 1.Qg5?
      • threat
        • 2.Be3#
      • 1...Qxd5+
        • 2.Qxd5#
      • 1...Kxc5
        • 2.d4#
      • 1...Qxd3
        • 2.Rc4#
      • 1...Bxc5
        • 2.Sb5#
        • 2.Qe5#
      • 1...Qc4
        • 2.Rxc4#
      • 1...hxg5!
  • Keys
    • 1.Kh2!
      • threat
        • 2.Qg1#
      • 1...Kxc5
        • 2.d4#
      • 1...Qxd3
        • 2.Rc4#
      • 1...Bxc5
        • 2.Sb5#
      • 1...Qc4
        • 2.Rxc4#
      • 1...Qd1
        • 2.Rc4#
      • 1...Qb1
        • 2.Rc4#

Anticipated by 17127(1900)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 4
  • Sets
    • K(c);OGATE,S_FLIGHT,XR(F)::P(D)
    • Q(a);N_GUARD::R1(F)
    • Q(a);N_GUARD::R1(F),XQ(a)
    • Q(a);CHECK,OGATE,XP(G)::QAR1(H),XQ(a)
    • Q(a);N_GUARD,P_PINR(A)::R1(F)
    • Q(a);N_GUARD,XS(C)::R1(F)
    • Q(a);N_GUARD,P_SPINQ(a),XP(D)::R1(F)
    • B(d);SBLOCK,XR(F)::S(C)
  • Tries
    • Try
      • Q(H);
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);CHECK,OGATE,XP(G)::QAR1(H),XQ(a)
        • Q(a);N_GUARD::R1(F),XQ(a)
      • Refutation
        • S(f);XQ(H)
    • Try
      • Q(H);
      • Threat
        • B(E)
      • Vars
        • Q(a);CHECK,OGATE,XP(G)::QAR1(H),XQ(a)
        • K(c);OGATE,S_FLIGHT,XR(F)::P(D)
        • Q(a);N_GUARD,P_SPINQ(a),XP(D)::R1(F)
        • Q(a);N_GUARD::R1(F),XQ(a)
      • Refutation
        • P(e);XQ(H)
  • Actual
    • K(B);P-FLIGHT
    • Threat
      • QAB(H)
    • Vars
      • K(c);OGATE,S_FLIGHT,XR(F)::P(D)
      • Q(a);N_GUARD,P_SPINQ(a),XP(D)::R1(F)
      • B(d);SBLOCK,XR(F)::S(C)
      • Q(a);N_GUARD::R1(F),XQ(a)
      • Q(a);N_GUARD::R1(F)
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).