MESON Chess Problem Database

Problem Display
PID: 223074 (8/1p6/1P2pP1N/4k3/K1R2N2/2P1q3/3B4/4R1Q1 w - - 0 1)

Willis, J

Australasian (The), 1885

8/1p6/1P2pP1N/4k3/K1R2N2/2P1q3/3B4/4R1Q1

#2

10 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe1
      • 2.Qd4#
    • 1...Qe2
      • 2.Qd4#
    • 1...Qe4
      • 2.Qd4#
  • Tries
    • 1.Sf7+?
      • 1...Kf5
        • 2.Qg5#
        • 2.Qg6#
      • 1...Kxf6!
    • 1.Rxe3+?
      • 1...Kxf6
        • 2.Rxe6#
      • 1...Kd6!
    • 1.Rc5+?
      • 1...Ke4
        • 2.Qxe3#
      • 1...Kxf4
        • 2.Qxe3#
        • 2.Qg4#
      • 1...Kxf6
        • 2.Qg5#
      • 1...Kd6!
    • 1.Qxe3+?
      • 1...Kd6
        • 2.Qd4#
        • 2.Qd3#
        • 2.Qxe6#
      • 1...Kxf6!
  • Keys
    • 1.Rc7!
      • 1...Qe4+
        • 2.Qd4#
      • 1...Ke4
        • 2.Qxe3#
      • 1...Kxf4
        • 2.Qxe3#
      • 1...Kd6
        • 2.Sf7#
      • 1...Kxf6
        • 2.Qg7#
      • 1...Qxe1
        • 2.Qd4#
      • 1...Qe2
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(a);N_SPINQ(a),OGATE,XR(A)::QAB1(B)
    • Q(a);OGATE::QAB1(B)
    • Q(a);OGATE,P_PINR(F)::QAB1(B)
  • Tries
    • Try
      • S(J);CHECK
      • Refutation
        • K(b);N_SPINQ(a),S_FLIGHT,XP(I)
    • Try
      • R(A);CHECK,XQ(a)
      • Vars
        • K(b);OGATE,S_FLIGHT,XP(I)::R1(A),XP(c)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • R(F);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(B),XQ(a)
        • K(b);N_SPINQ(a),S_FLIGHT,XP(I)::QAB1(B)
      • Refutation
        • K(b);N_SPINQ(a),S_FLIGHT
    • Try
      • Q(B);CHECK,XQ(a)
      • Refutation
        • K(b);S_FLIGHT,XP(I)
  • Actual
    • R(F);
    • Vars
      • Q(a);CHECK,OGATE::QAB1(B)
      • K(b);P-FLIGHT::QAR1(B),XQ(a)
      • K(b);S_FLIGHT,XS(G)::QAB1(B),XQ(a)
      • K(b);N_SPINQ(a),S_FLIGHT::S(J)
      • K(b);N_SPINQ(a),OGATEB,S_FLIGHT,XP(I)::QAB1(B)
      • Q(a);N_SPINQ(a),OGATE,XR(A)::QAB1(B)
      • Q(a);OGATE::QAB1(B)
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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).