MESON Chess Problem Database

Problem Display
PID: 245351 (1n1R4/5N1N/2pPk1P1/K3prpn/4Q2q/6B1/3R4/8 w - - 0 1)

Onkoud, Abdelaziz

Pat a Mat, 2013

1n1R4/5N1N/2pPk1P1/K3prpn/4Q2q/6B1/3R4/8

#2

9 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg3
      • 2.Qc4#
    • 1...Qh2
      • 2.Qc4#
    • 1...Qh3
      • 2.Qc4#
    • 1...Rf1
      • 2.Qxe5#
    • 1...Rf2
      • 2.Qxe5#
    • 1...Rf3
      • 2.Qxe5#
    • 1...Rf4
      • 2.Qxe5#
    • 1...Rf6
      • 2.Sf8#
      • 2.Qxe5#
    • 1...Rxf7
      • 2.Qxe5#
    • 1...Sf6
      • 2.Sf8#
    • 1...Sd7
      • 2.Re8#
    • 1...g4
      • 2.Qc4#
    • 1...c5
      • 2.Qd5#
  • Tries
    • 1.Sxe5?
      • threat
        • 2.Re8#
      • 1...Rxe5+
        • 2.Qxe5#
      • 1...Rf7
        • 2.Sg4#
      • 1...Rf8
        • 2.Sg4#
      • 1...Sf6
        • 2.Sf8#
      • 1...g4
        • 2.Qc4#
      • 1...Sg7!
    • 1.Sfxg5+?
      • 1...Qxg5
        • 2.Qc4#
      • 1...Rxg5!
  • Keys
    • 1.Bxe5!
      • threat
        • 2.Sf8#
      • 1...Rxe5+
        • 2.Qxe5#
      • 1...Rxf7
        • 2.Bf4#
      • 1...Sd7
        • 2.Re8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 10
  • Sets
    • Q(a);N_GUARD,XB(B)::QAB(C)
    • Q(a);N_GUARD::QAB(C)
    • R(c);N_GUARD::QAR1(C),XP(b)
    • R(c);N_GUARD,XS(G)::QAR1(C),XP(b)
    • S(e);SBLOCK::S(H)
    • S(h);SBLOCK::R(I)
    • P(d);S_CUTQ(a)::QAB(C)
    • P(f);N_GUARD::QAB1(C)
  • Tries
    • Try
      • S(G);P_SPINS(G),XP(b)
      • Threat
        • R(I)
      • Vars
        • R(c);CHECK,OGATE,P_SPINR(c),XS(G)::QAR1(C),XR(c)
        • R(c);N_PINS(G)::QAR(C)+S(G)
        • S(e);SBLOCK,S_CUTR(c)::S(H)
        • P(d);S_CUTQ(a)::QAB(C)
      • Refutation
        • S(e);
    • Try
      • S(G);CHECK,XP(d)
      • Vars
        • Q(a);XS(G)::QAB(C)
      • Refutation
        • R(c);XS(G)
  • Actual
    • B(B);P_SPINB(B),XP(b)
    • Threat
      • S(H)
    • Vars
      • R(c);CHECK,OGATE,P_SPINR(c),XB(B)::QAR1(C),XR(c)
      • R(c);N_PINB(B),XS(G)::QAR(C)+B(B)
      • S(h);SBLOCK::R(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).