MESON Chess Problem Database

Problem Display
PID: 205527 (8/8/8/5Q2/2p5/2K5/3p4/3krR2 w - - 0 1)

Pape, Edouard

L'Echiquier Marseillais, 1925

8/8/8/5Q2/2p5/2K5/3p4/3krR2

#2

3 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kc1
      • 2.Qc2#
    • 1...Ke2
      • 2.Qf3#
    • 1...Rxf1
      • 2.Qxf1#
  • Tries
    • 1.Kb2?
      • threat
        • 2.Qg4#
        • 2.Qf3#
        • 2.Qh5#
      • 1...Ke2
        • 2.Qf3#
      • 1...Rxf1
        • 2.Qxf1#
      • 1...c3+!
    • 1.Qd3?
      • threat
        • 2.Qxd2#
      • 1...Kc1
        • 2.Qc2#
      • 1...cxd3!
    • 1.Qh3?
      • 1...Ke2
        • 2.Qf3#
      • 1...Rxf1
        • 2.Qxf1#
      • 1...Kc1!
    • 1.Qe4?
      • 1...Kc1
        • 2.Qc2#
      • 1...Rxf1!
    • 1.Qd5?
      • threat
        • 2.Qxd2#
      • 1...Ke2
        • 2.Qf3#
      • 1...Kc1!
    • 1.Qg5?
      • threat
        • 2.Qxd2#
      • 1...Kc1
        • 2.Rxe1#
      • 1...Ke2!
    • 1.Qf6?
      • 1...Ke2
        • 2.Qf3#
      • 1...Rxf1
        • 2.Qxf1#
      • 1...Kc1!
    • 1.Qf7?
      • 1...Ke2
        • 2.Qf3#
      • 1...Rxf1
        • 2.Qxf1#
      • 1...Kc1!
    • 1.Qf8?
      • 1...Ke2
        • 2.Qf3#
      • 1...Rxf1
        • 2.Qxf1#
      • 1...Kc1!
  • Keys
    • 1.Qf4!
      • threat
        • 2.Qxd2#
      • 1...Kc1
        • 2.Rxe1#
      • 1...Ke2
        • 2.Qf3#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • K(a);P-FLIGHT::QAR1(C)
    • K(a);N_SPINR(b),S_FLIGHT::QAB1(C)
    • R(b);N_SPINR(b),OGATE,XR(A)::QAR2(C),XR(b)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Threat
        • DUALS(3)
      • Vars
        • K(a);N_SPINR(b),S_FLIGHT::QAB1(C)
        • R(b);N_SPINR(b),OGATE,XR(A)::QAR2(C),XR(b)
      • Refutation
        • P(d);CHECK
    • Try
      • Q(C);P_PINP(c)
      • Threat
        • QAR1(C),XP(c)
      • Vars
        • K(a);N_SPINP(c),P-FLIGHT::QAR1(C)
      • Refutation
        • P(d);N_SPINP(c),XQ(C)
    • Try
      • Q(C);
      • Vars
        • K(a);N_SPINR(b),S_FLIGHT::QAB1(C)
        • R(b);N_SPINR(b),OGATE,XR(A)::QAR2(C),XR(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
      • Refutation
        • R(b);N_SPINR(b),XR(A)
    • Try
      • Q(C);P_PINP(c)
      • Threat
        • QAR1(C),XP(c)
      • Vars
        • K(a);N_SPINP(c),N_SPINR(b),S_FLIGHT::QAB1(C)
      • Refutation
        • K(a);N_SPINP(c),P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAR1(C),XP(c)
      • Vars
        • K(a);P-FLIGHT,P_SPINP(c)::R(A),XR(b)
      • Refutation
        • K(a);N_SPINR(b),S_FLIGHT
    • Try
      • Q(C);
      • Vars
        • K(a);N_SPINR(b),S_FLIGHT::QAB1(C)
        • R(b);N_SPINR(b),OGATE,XR(A)::QAR2(C),XR(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);
      • Vars
        • K(a);N_SPINR(b),S_FLIGHT::QAB1(C)
        • R(b);N_SPINR(b),OGATE,XR(A)::QAR2(C),XR(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);
      • Vars
        • K(a);N_SPINR(b),S_FLIGHT::QAB1(C)
        • R(b);N_SPINR(b),OGATE,XR(A)::QAR2(C),XR(b)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(C);
    • Threat
      • QAR1(C),XP(c)
    • Vars
      • K(a);P-FLIGHT,P_SPINP(c)::R(A),XR(b)
      • K(a);N_SPINR(b),S_FLIGHT::QAB1(C)
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).