MESON Chess Problem Database

Problem Display
PID: 278084 (8/K1p5/3PnQ2/3pp2r/N3kP2/1R1pNpRB/4n3/6B1 w - - 0 1)

Petite, Efren

Phenix, 2007

8/K1p5/3PnQ2/3pp2r/N3kP2/1R1pNpRB/4n3/6B1

#2

10 + 9

3713 Snap 2024

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Rb4#
    • 1...Rxh3
      • 2.Qxe5#
    • 1...Rh4
      • 2.Qxe5#
    • 1...Rh6
      • 2.Qxe5#
    • 1...Rh7
      • 2.Qxe5#
    • 1...Rh8
      • 2.Qxe5#
    • 1...S2d4
      • 2.Sc3#
    • 1...S6d4
      • 2.Sc5#
    • 1...Sg5
      • 2.Qxe5#
  • Tries
    • 1.Bf5+?
      • 1...Kd4
        • 2.Rxd3#
        • 2.Rb4#
        • 2.Qxe5#
      • 1...Kxf4
        • 2.Rg4#
      • 1...Rxf5!
    • 1.Rb4+?
      • 1...S2d4
        • 2.Sc3#
      • 1...S6d4
        • 2.Sc5#
      • 1...d4!
    • 1.Qf5+?
      • 1...Kd4
        • 2.Rxd3#
        • 2.Rb4#
        • 2.Qxd3#
      • 1...Rxf5!
    • 1.Qg6+?
      • 1...Kd4
        • 2.Rxd3#
        • 2.Rb4#
        • 2.Qxd3#
      • 1...Kxf4
        • 2.Sxd5#
        • 2.Rg4#
        • 2.Qg4#
      • 1...Rf5!
  • Keys
    • 1.Sf5!
      • threat
        • 2.Qxe5#
      • 1...Kxf4
        • 2.Rg4#
      • 1...Rxf5
        • 2.Qxf5#
      • 1...S2xf4
        • 2.Sc3#
      • 1...S6xf4
        • 2.Sc5#
      • 1...exf4
        • 2.Qxe6#
      • 1...cxd6
        • 2.Sxd6#

Anticipated by 168394(1973)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 9
  • Sets
    • K(d);P-FLIGHT,P_SPINP(f),S_CUTP(e),S_CUTS(a),S_CUTS(h)::R(B)
    • R(g);N_GUARD,XB(E)::QAR1(I),XP(f)
    • R(g);N_GUARD::QAR1(I),XP(f)
    • S(a);N_GUARD,SBLOCK::S(F)
    • S(h);N_GUARD,SBLOCK::S(F)
    • S(h);S_CUTR(g)::QAR1(I),XP(f)
  • Tries
    • Try
      • B(E);CHECK
      • Vars
        • K(d);N_GUARD,P-FLIGHT,S_CUTR(g),XP(G)::R1(D)
      • Refutation
        • R(g);XB(E)
    • Try
      • R(B);CHECK
      • Vars
        • S(a);P_SPINS(a)::S(F)
        • S(h);P_SPINS(h)::S(F)
      • Refutation
        • P(e);P_SPINP(e)
    • Try
      • Q(I);CHECK
      • Refutation
        • R(g);XQ(I)
    • Try
      • Q(I);CHECK
      • Refutation
        • R(g);P_SPINR(g)
  • Actual
    • S(C);
    • Threat
      • QAR1(I),XP(f)
    • Vars
      • K(d);OGATEB,P-FLIGHT,XP(G)::R1(D)
      • R(g);OGATE,XS(C)::QAB1(I),XR(g)
      • S(a);N_GUARD,SBLOCK,XP(G)::S(F)
      • S(h);N_GUARD,SBLOCK,XP(G)::S(F)
      • P(f);OGATEB,SBLOCK,XP(G)::QAR2(I),XS(h)
      • P(i);XP(H)::S(C),XP(i)
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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).