MESON Chess Problem Database

Problem Display
PID: 139717 (b1B5/4N1Q1/1Ppk1P2/n5K1/1P1q1P2/3n4/3R2PB/2Rr4 w - - 0 1)

Pape, Edouard

Good Companions (February), 1924

b1B5/4N1Q1/1Ppk1P2/n5K1/1P1q1P2/3n4/3R2PB/2Rr4

#2

12 + 7

3391 Het Half Pin Thema 1924

SOLUTION

  • SOUND
  • Sets
    • 1...Qc5+
      • 2.bxc5#
    • 1...Qe5+
      • 2.fxe5#
    • 1...Qxb6
      • 2.f5#
    • 1...Qxf6+
      • 2.Qxf6#
    • 1...Qxf4+
      • 2.Bxf4#
    • 1...Sxc1
      • 2.f5#
    • 1...Se1
      • 2.f5#
    • 1...Sb2
      • 2.f5#
    • 1...Sf2
      • 2.f5#
    • 1...Sxb4
      • 2.f5#
    • 1...Sxf4
      • 2.Bxf4#
    • 1...Sc5
      • 2.bxc5#
      • 2.f5#
    • 1...Se5
      • 2.fxe5#
    • 1...Sb7
      • 2.Rxc6#
  • Tries
    • 1.Qh8?
      • threat
        • 2.Qd8#
      • 1...Qc5+
        • 2.bxc5#
      • 1...Qe5+
        • 2.fxe5#
      • 1...Qxf6+
        • 2.Qxf6#
      • 1...Qxf4+
        • 2.Bxf4#
      • 1...Qxb6
        • 2.f5#
      • 1...Sxf4
        • 2.Bxf4#
      • 1...Sc5
        • 2.bxc5#
        • 2.f5#
      • 1...Se5
        • 2.fxe5#
      • 1...Sb7
        • 2.Rxc6#
      • 1...Qd5+!
  • Keys
    • 1.Qf8!
      • threat
        • 2.Qd8#
      • 1...Qc5+
        • 2.bxc5#
      • 1...Qe5+
        • 2.fxe5#
      • 1...Qxf6+
        • 2.Qxf6#
      • 1...Qxf4+
        • 2.Bxf4#
      • 1...Qd5+
        • 2.Sf5#
      • 1...Qxb6
        • 2.f5#
      • 1...Sxf4
        • 2.Bxf4#
      • 1...Sc5
        • 2.bxc5#
        • 2.f5#
      • 1...Se5
        • 2.fxe5#
      • 1...Sb7
        • 2.Rxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • Q(c);CHECK,OGATE,P_SPINS(b)::P(E),XQ(c)
    • Q(c);CHECK,OGATE,P_SPINS(b)::P(F),XQ(c)
    • Q(c);N_GUARD,P_SPINS(b),XP(H)::B(D)+P(F)
    • Q(c);CHECK,OGATE,P_SPINS(b),XP(I)::QAR2(K),XQ(c)
    • Q(c);CHECK,OGATE,P_SPINQ(c),P_SPINS(b),XP(F)::B(D),XQ(c)
    • S(b);N_GUARD,P_SPINQ(c),XR(A)::B(D)+P(F)
    • S(b);N_GUARD,P_SPINQ(c)::B(D)+P(F)
    • S(b);N_GUARD,P_SPINQ(c),XP(E)::B(D)+P(F)
    • S(b);OGATE,P_SPINQ(c),P_SPINS(b),XP(F)::B(D),XS(b)
    • S(b);OGATE,P_SPINQ(c)::P(F),XS(b)
    • S(d);N_GUARD,S_CUTB(g)::R1(A),XP(e)
  • Tries
    • Try
      • Q(K);
      • Threat
        • QAR2(K)
      • Vars
        • Q(c);CHECK,OGATE,P_SPINS(b)::P(E),XQ(c)
        • Q(c);CHECK,OGATE,P_SPINS(b)::P(F),XQ(c)
        • Q(c);CHECK,OGATE,P_SPINS(b),XP(I)::QAR2(K),XQ(c)
        • Q(c);CHECK,OGATE,P_SPINQ(c),P_SPINS(b),XP(F)::B(D),XQ(c)
        • Q(c);N_GUARD,P_SPINS(b),XP(H)::B(D)+P(F)
        • S(b);OGATE,P_SPINQ(c),P_SPINS(b),XP(F)::B(D),XS(b)
        • S(b);OGATE,P_SPINQ(c)::P(F),XS(b)
        • S(d);N_GUARD,S_CUTB(g)::R1(A),XP(e)
      • Refutation
        • Q(c);CHECK
  • Actual
    • Q(K);
    • Threat
      • QAR2(K)
    • Vars
      • Q(c);CHECK,OGATE,P_SPINS(b)::P(E),XQ(c)
      • Q(c);CHECK,OGATE,P_SPINS(b)::P(F),XQ(c)
      • Q(c);CHECK,OGATE,P_SPINS(b),XP(I)::QAR2(K),XQ(c)
      • Q(c);CHECK,OGATE,P_SPINQ(c),P_SPINS(b),XP(F)::B(D),XQ(c)
      • Q(c);CHECK,SBLOCK::QAB(K)+S(J),DCHECK
      • Q(c);N_GUARD,P_SPINS(b),XP(H)::B(D)+P(F)
      • S(b);OGATE,P_SPINQ(c),P_SPINS(b),XP(F)::B(D),XS(b)
      • S(b);OGATE,P_SPINQ(c)::P(F),XS(b)
      • S(d);N_GUARD,S_CUTB(g)::R1(A),XP(e)
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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).