MESON Chess Problem Database

Problem Display
PID: 266370 (BB6/2r5/1bN3p1/Rr1k1PK1/R1b1N1n1/n7/2P5/4Q3 w - - 0 1)

Petite, Efren

Die Schwalbe, 1973

BB6/2r5/1bN3p1/Rr1k1PK1/R1b1N1n1/n7/2P5/4Q3

#2

10 + 8

SOLUTION

  • SOUND
  • Tries
    • 1.Sc3+?
      • 1...Kd6
        • 2.Qe7#
      • 1...Kc5!
    • 1.Sb4+?
      • 1...Kd4
        • 2.Qc3#
      • 1...Ke5!
    • 1.Se7+?
      • 1...Kd4
        • 2.Qc3#
      • 1...Ke5!
    • 1.Qd2+?
      • 1...Kxe4
        • 2.Qd3#
      • 1...Bd4
        • 2.Qxd4#
      • 1...Bd3!
    • 1.Qd1+?
      • 1...Kxe4
        • 2.Qd3#
      • 1...Bd4
        • 2.Qxd4#
      • 1...Bd3!
  • Keys
    • 1.Sf6+!
      • 1...Kc5
        • 2.Qb4#
      • 1...Kd6
        • 2.Qe7#
      • 1...Sxf6
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(e);N_SPINR(d),P-FLIGHT,P_PINP(F),P_SPINR(h)::QAB1(A)
      • Refutation
        • K(e);P-FLIGHT
    • Try
      • S(H);CHECK
      • Vars
        • K(e);N_SPINR(d),P-FLIGHT,P_PINP(F)::QAB1(A)
      • Refutation
        • K(e);P-FLIGHT
    • Try
      • S(H);CHECK
      • Vars
        • K(e);N_SPINR(d),P-FLIGHT,P_PINP(F),P_SPINB(b)::QAB1(A)
      • Refutation
        • K(e);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(e);N_SPINR(d),P_PINP(F),P_SPINB(b),S_CUTB(f),S_FLIGHT,XS(D)::QAB1(A)
        • B(f);N_GUARD,P_SPINB(f)::QAR1(A),XB(f)
      • Refutation
        • B(b);P_SPINB(b)
    • Try
      • Q(A);CHECK
      • Vars
        • K(e);N_SPINR(d),P_PINP(F),P_SPINB(b),S_CUTB(f),S_FLIGHT,XS(D)::QAB1(A)
        • B(f);N_GUARD,P_SPINB(f)::QAR1(A),XB(f)
      • Refutation
        • B(b);P_SPINB(b)
  • Actual
    • S(D);CHECK
    • Vars
      • K(e);P-FLIGHT,S_CUTS(c)::QAB1(A)
      • K(e);N_SPINR(d),P-FLIGHT,P_PINP(F),P_SPINR(h),S_CUTS(c)::QAB1(A)
      • S(c);XS(D)::QAR1(A)
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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).