MESON Chess Problem Database

Problem Display
PID: 45550 (2B1N1K1/BP3p2/8/1Prkp2Q/R1n2P2/3P4/b1Pp4/b7 w - - 0 1)

Stevenson, Edward

Double Pin-Mate after a Black King Move, 1980

2B1N1K1/BP3p2/8/1Prkp2Q/R1n2P2/3P4/b1Pp4/b7

#2

11 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Qxe5#
    • 1...Rxc8
      • 2.Qxf7#
    • 1...Bd4
      • 2.Qxf7#
    • 1...Sb2
      • 2.Qxf7#
      • 2.Qxe5#
    • 1...Sa3
      • 2.Qxf7#
    • 1...Se3
      • 2.Qxf7#
    • 1...Sa5
      • 2.Qxf7#
    • 1...Sb6
      • 2.Qxf7#
    • 1...Sd6
      • 2.Sf6#
  • Tries
    • 1.Sf6+?
      • 1...Kd4
        • 2.Qxe5#
      • 1...Kd6!
    • 1.Be6+?
      • 1...Kd4
        • 2.Qxe5#
      • 1...Kxe6
        • 2.Qxf7#
      • 1...fxe6!
    • 1.Qf3+?
      • 1...e4
        • 2.Qxe4#
      • 1...Kd4!
    • 1.Qh1+?
      • 1...e4
        • 2.Qxe4#
      • 1...Kd4!
  • Keys
    • 1.Qf5!
      • threat
        • 2.Qe4#
      • 1...Kd4
        • 2.Qxe5#
      • 1...Rxc8
        • 2.Qxf7#
      • 1...Sd6
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 5
  • Sets
    • K(f);N_SPINP(g),P-FLIGHT,P_SPINR(e),P_SPINS(d)::QAB1(F),XP(g)
    • R(e);P_PINS(J),XB(I)::QAB(F),XP(h)
    • B(a);SBLOCK::QAB(F),XP(h)
    • S(d);::QAB(F),XP(h)
    • S(d);SBLOCK::S(J)
  • Tries
    • Try
      • S(J);CHECK
      • Vars
        • K(f);N_SPINP(g),P-FLIGHT,P_SPINR(e),P_SPINS(d)::QAB1(F),XP(g)
      • Refutation
        • K(f);N_SPINP(g),P-FLIGHT
    • Try
      • B(I);CHECK
      • Vars
        • K(f);N_SPINP(g),P-FLIGHT,P_SPINR(e),P_SPINS(d)::QAB1(F),XP(g)
        • K(f);N_SPINP(g),S_FLIGHT,XB(I)::QAB1(F),XP(h)
      • Refutation
        • P(h);XB(I)
    • Try
      • Q(F);CHECK,N_PINP(g)
      • Vars
        • P(g);P_SPINP(g)::QAB1(F),XP(g)
      • Refutation
        • K(f);P-FLIGHT,P_SPINR(e),P_SPINS(d)
    • Try
      • Q(F);CHECK,N_PINP(g)
      • Vars
        • P(g);P_SPINP(g)::QAB1(F),XP(g)
      • Refutation
        • K(f);P-FLIGHT,P_SPINR(e),P_SPINS(d)
  • Actual
    • Q(F);
    • Threat
      • QAB1(F)
    • Vars
      • K(f);N_SPINP(g),P-FLIGHT,P_SPINR(e),P_SPINS(d)::QAB1(F),XP(g)
      • R(e);P_PINS(J),XB(I)::QAB(F),XP(h)
      • S(d);SBLOCK::S(J)
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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).