MESON Chess Problem Database

Problem Display
PID: 189868 (4Q1n1/4p1B1/K3kp1n/1p1R4/1Pp1P1p1/4R1P1/B7/8 w - - 0 1)

Janet, Frank

Staten Islander, 1912

4Q1n1/4p1B1/K3kp1n/1p1R4/1Pp1P1p1/4R1P1/B7/8

#2

9 + 8

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sf5
      • 2.Qxg8#
    • 1...Sf7
      • 2.Qd7#
      • 2.Qc8#
  • Tries
    • 1.Bxc4?
      • 1...Sf5
        • 2.Qxg8#
        • 2.exf5#
      • 1...Sf7
        • 2.Qd7#
        • 2.Qc8#
      • 1...f5
        • 2.exf5#
      • 1...bxc4!
    • 1.Rc3?
      • 1...Sf5
        • 2.Qxg8#
      • 1...Sf7
        • 2.Qd7#
        • 2.Qc8#
      • 1...f5!
    • 1.Red3?
      • 1...c3
        • 2.Rxb5#
        • 2.Rc5#
        • 2.Rf5#
        • 2.Rg5#
        • 2.Rh5#
      • 1...Sf5
        • 2.Qxg8#
        • 2.exf5#
      • 1...Sf7
        • 2.Qd7#
        • 2.Qc8#
      • 1...f5
        • 2.Re5#
        • 2.Rd6#
      • 1...cxd3!
    • 1.Qxg8+?
      • 1...Sf7
        • 2.Qc8#
      • 1...Sxg8!
  • Keys
    • 1.e5!
      • 1...Kxd5
        • 2.Qd7#
      • 1...Kf5
        • 2.e6#
      • 1...fxe5
        • 2.Rexe5#
      • 1...c3
        • 2.exf6#
      • 1...Sf5
        • 2.Qxg8#
      • 1...Sf7
        • 2.Qd7#
      • 1...f5
        • 2.Rd6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(f);N_GUARD::QAB(I),XS(h)
  • Tries
    • Try
      • B(A);XP(a)
      • Vars
        • P(e);OGATE::R(B)+P(E)DCHECK,XP(e)
      • Refutation
        • P(c);XB(A)
    • Try
      • R(B);
      • Vars
        • S(f);N_GUARD::QAB(I),XS(h)
      • Refutation
        • P(e);
    • Try
      • R(B);
      • Refutation
        • P(a);XR(B)
    • Try
      • Q(I);CHECK,N_PINP(g),XS(h)
      • Vars
        • S(f);P_SPINS(f),SBLOCK::QAB(I)
      • Refutation
        • S(f);XQ(I)
  • Actual
    • P(E);
    • Vars
      • K(d);N_SPINP(g),P_SPINP(a),S_FLIGHT,XR(F)::QAR2(I)
      • K(d);N_SPINP(g),OGATE,S_FLIGHT::R(F)+P(E)
      • P(e);N_SPINP(g),OGATE,P_SPINP(e),XP(E)::R1(B),XP(e)
      • P(a);::R(B)+P(E),XP(e)
      • S(f);N_GUARD,SBLOCK::QAB(I),XS(h)
      • S(f);SBLOCK::QAB1(I)
      • P(e);SBLOCK::R1(F)
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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).