MESON Chess Problem Database

Problem Display
PID: 77239 (8/6p1/6pk/4Q2N/8/4p3/3pB3/3K4 w - - 0 1)

Pape, Edouard

L'Echiquier Marseillais, 1927

8/6p1/6pk/4Q2N/8/4p3/3pB3/3K4

#2

4 + 5

3713 Snap 2008
5454 Near Snap 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Kh7
      • 2.Qxg7#
    • 1...gxh5
      • 2.Qxh5#
    • 1...g5
      • 2.Qxg7#
  • Tries
    • 1.Bf3?
      • 1...Kh7
        • 2.Qxg7#
      • 1...gxh5
        • 2.Qxh5#
      • 1...g5
        • 2.Qxg7#
      • 1...e2+!
    • 1.Bg4?
      • 1...Kh7
        • 2.Qxg7#
      • 1...gxh5
        • 2.Qxh5#
      • 1...g5
        • 2.Qxg7#
      • 1...e2+!
    • 1.Qd4?
      • 1...Kg5
        • 2.Qf4#
      • 1...Kh7
        • 2.Qxg7#
      • 1...g5
        • 2.Qxg7#
      • 1...gxh5!
    • 1.Qd6?
      • 1...Kg5
        • 2.Qf4#
      • 1...Kh7!
    • 1.Qf6?
      • 1...Kh7
        • 2.Qxg7#
      • 1...gxf6!
    • 1.Qc7?
      • 1...Kg5
        • 2.Qf4#
      • 1...Kh7
        • 2.Qxg7#
      • 1...g5
        • 2.Qxg7#
      • 1...gxh5!
    • 1.Qe7?
      • 1...Kh7
        • 2.Qxg7#
      • 1...g5
        • 2.Qxg7#
      • 1...gxh5!
  • Keys
    • 1.Qh2!
      • 1...Kg5
        • 2.Qf4#
      • 1...Kh7
        • 2.Sf6#
      • 1...gxh5
        • 2.Qxh5#
      • 1...g5
        • 2.Sf4#

Anticipated by 21309(1918)

This anticipates 102513(1964), 12404(1978), 150698(1982), 79321(1988), 203054(1990), 245207(2000)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(d);P-FLIGHT::QAR1(C),XP(e)
    • P(c);OGATE,XS(D)::QAR1(C),XP(c)
    • P(c);::QAB1(C),XP(e)
  • Tries
    • Try
      • B(B);
      • Vars
        • K(d);P-FLIGHT::QAR1(C),XP(e)
        • P(c);OGATE,XS(D)::QAR1(C),XP(c)
        • P(c);::QAB1(C),XP(e)
      • Refutation
        • P(b);CHECK
    • Try
      • B(B);
      • Vars
        • K(d);P-FLIGHT::QAR1(C),XP(e)
        • P(c);OGATE,XS(D)::QAR1(C),XP(c)
        • P(c);::QAB1(C),XP(e)
      • Refutation
        • P(b);CHECK
    • Try
      • Q(C);
      • Vars
        • K(d);S_FLIGHT::QAB1(C)
        • K(d);P-FLIGHT::QAR1(C),XP(e)
        • P(c);::QAB1(C),XP(e)
      • Refutation
        • P(c);XS(D)
    • Try
      • Q(C);P_PINP(c)
      • Vars
        • K(d);N_SPINP(c),S_FLIGHT::QAB1(C)
      • Refutation
        • K(d);N_SPINP(c),P-FLIGHT
    • Try
      • Q(C);P_PINP(c)
      • Vars
        • K(d);N_SPINP(c),P-FLIGHT::QAR1(C),XP(e)
      • Refutation
        • P(e);N_SPINP(c),XQ(C)
    • Try
      • Q(C);
      • Vars
        • K(d);S_FLIGHT::QAB1(C)
        • K(d);P-FLIGHT,P_SPINP(e)::QAR1(C),XP(e)
        • P(c);::QAB1(C),XP(e)
      • Refutation
        • P(c);XS(D)
    • Try
      • Q(C);
      • Vars
        • K(d);P-FLIGHT,P_SPINP(e)::QAR1(C),XP(e)
        • P(c);::QAB1(C),XP(e)
      • Refutation
        • P(c);XS(D)
  • Actual
    • Q(C);
    • Vars
      • K(d);S_FLIGHT::QAB1(C)
      • K(d);P-FLIGHT::QAR(C)+S(D),DCHECK
      • P(c);OGATE,P_SPINP(c),XS(D)::QAR1(C),XP(c)
      • P(c);SBLOCK::QAR(C)+S(D)
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).