MESON Chess Problem Database

Problem Display
PID: 1149 (1Q2N1K1/8/2P1Pp2/R1bk1p2/8/2P4B/3P1N2/8 w - - 0 1)

McWilliam, Robert C

Problem Observer, 1988

1Q2N1K1/8/2P1Pp2/R1bk1p2/8/2P4B/3P1N2/8

#2

10 + 4

3713 Snap 2007
15393 McWilliam Scrapbook 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Kxc6
      • 2.Bg2#
  • Tries
    • 1.Sxf6+?
      • 1...Kc4
        • 2.Bf1#
        • 2.Qb5#
      • 1...Kxc6
        • 2.Bg2#
      • 1...Kxe6!
    • 1.Bf1?
      • threat
        • 2.Qd6#
      • 1...Kxc6
        • 2.Bg2#
      • 1...Kxe6!
    • 1.Bg2+?
      • 1...Kc4
        • 2.Qb5#
      • 1...Kxe6!
    • 1.Bxf5?
      • 1...Kxc6
        • 2.Be4#
      • 1...Kc4!
    • 1.Rxc5+?
      • 1...Kxe6
        • 2.Qd6#
      • 1...Kxc5!
    • 1.Qf4?
      • 1...Kxe6
        • 2.Qe4#
      • 1...Kxc6!
    • 1.Qb3+?
      • 1...Kxc6
        • 2.Bg2#
      • 1...Ke5!
    • 1.Qb4?
      • 1...Kxc6
        • 2.Bg2#
        • 2.Rxc5#
      • 1...Kxe6
        • 2.Qe4#
      • 1...f4
        • 2.Rxc5#
        • 2.Qxc5#
        • 2.Qe4#
      • 1...Ke5!
    • 1.d3?
      • threat
        • 2.Qd6#
      • 1...Kxc6
        • 2.Bg2#
      • 1...Kxe6!
    • 1.d4?
      • 1...Kc4
        • 2.Rxc5#
      • 1...Kxc6
        • 2.Bg2#
        • 2.Rxc5#
      • 1...f4
        • 2.Rxc5#
      • 1...Kxe6!
  • Keys
    • 1.Qb1!
      • 1...Kc4
        • 2.Qa2#
      • 1...Ke5
        • 2.Qxf5#
      • 1...Kxc6
        • 2.Bg2#
      • 1...Kxe6
        • 2.Qe4#
      • 1...f4
        • 2.Qe4#

Anticipated by 31385(1884)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(b);N_SPINB(a),S_FLIGHT,XP(F)::B(D)
  • Tries
    • Try
      • S(I);CHECK,XP(d)
      • Vars
        • K(b);N_SPINB(a),S_FLIGHT,XP(F)::B(D)
      • Refutation
        • K(b);N_SPINB(a),P_SPINP(c),S_FLIGHT,XP(G)
    • Try
      • B(D);
      • Threat
        • QAR1(H)
      • Vars
        • K(b);N_SPINB(a),S_FLIGHT,XP(F)::B(D)
      • Refutation
        • K(b);N_SPINB(a),S_FLIGHT,XP(G)
    • Try
      • B(D);CHECK
      • Vars
        • K(b);N_SPINB(a),S_FLIGHT::QAB1(H)
      • Refutation
        • K(b);N_SPINB(a),S_FLIGHT,XP(G)
    • Try
      • B(D);XP(c)
      • Vars
        • K(b);N_SPINB(a),S_FLIGHT,XP(F)::B(D)
      • Refutation
        • K(b);N_SPINB(a),S_FLIGHT
    • Try
      • R(E);CHECK,XB(a)
      • Vars
        • K(b);P_SPINP(c),S_FLIGHT,XP(G)::QAR1(H)
      • Refutation
        • K(b);P-FLIGHT,XR(E)
    • Try
      • Q(H);
      • Vars
        • K(b);N_SPINB(a),P_SPINP(c),S_FLIGHT,XP(G)::QAR2(H)
      • Refutation
        • K(b);N_SPINB(a),S_FLIGHT,XP(F)
    • Try
      • Q(H);CHECK
      • Vars
        • K(b);N_SPINB(a),S_FLIGHT,XP(F)::B(D)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(H);
      • Vars
        • K(b);N_SPINB(a),P_SPINP(c),S_FLIGHT,XP(G)::QAR2(H)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • P(A);
      • Threat
        • QAR1(H)
      • Vars
        • K(b);N_SPINB(a),S_FLIGHT,XP(F)::B(D)
      • Refutation
        • K(b);N_SPINB(a),P_SPINP(c),S_FLIGHT,XP(G)
    • Try
      • P(A);
      • Vars
        • K(b);N_SPINB(a),S_FLIGHT::R1(E),XB(a)
        • P(c);::R1(E),XB(a)
      • Refutation
        • K(b);N_SPINB(a),P_SPINP(c),S_FLIGHT,XP(G)
  • Actual
    • Q(H);
    • Vars
      • K(b);N_SPINB(a),S_FLIGHT::QAB(H)
      • K(b);P-FLIGHT::QAR1(H),XP(c)
      • K(b);N_SPINB(a),S_FLIGHT,XP(F)::B(D)
      • K(b);N_SPINB(a),P_SPINP(c),S_FLIGHT,XP(G)::QAR2(H)
      • P(c);N_GUARD::QAB1(H)
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).