MESON Chess Problem Database

Problem Display
PID: 162842 (4q1B1/2B1pr1b/2p3n1/2Nkp2n/4p3/4P1p1/5QR1/2R2K2 w - - 0 1)

Onkoud, Abdelaziz

3rd Comm., Phenix, 2016

4q1B1/2B1pr1b/2p3n1/2Nkp2n/4p3/4P1p1/5QR1/2R2K2

#2

8 + 11

702 Phenix 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Shf4
      • 2.Qa2#
    • 1...Sf6
      • 2.Qa2#
      • 2.Qd2#
    • 1...Sgf4
      • 2.Qa2#
  • Tries
    • 1.Ke1?
      • threat
        • 2.Qa2#
        • 2.Qd2#
      • 1...Qa8
        • 2.Qd2#
      • 1...Qb8
        • 2.Qd2#
      • 1...Shf4
        • 2.Qa2#
      • 1...Sgf4
        • 2.Qa2#
      • 1...gxf2+!
    • 1.Kg1?
      • threat
        • 2.Qa2#
        • 2.Qd2#
      • 1...Qa8
        • 2.Qd2#
      • 1...Qb8
        • 2.Qd2#
      • 1...Shf4
        • 2.Qa2#
      • 1...Sgf4
        • 2.Qa2#
      • 1...gxf2+!
    • 1.Bxf7+?
      • 1...e6
        • 2.Qa2#
        • 2.Qd2#
      • 1...Qxf7!
    • 1.Qf3?
      • threat
        • 2.Rd2#
      • 1...Shf4
        • 2.Qxe4#
      • 1...Sgf4!
    • 1.Qf6?
      • threat
        • 2.Rd2#
      • 1...Sgf4
        • 2.Qxe5#
      • 1...Shf4!
    • 1.Qxf7+?
      • 1...e6
        • 2.Rd2#
      • 1...Qxf7+!
  • Keys
    • 1.Qf5!
      • threat
        • 2.Rd2#
      • 1...Shf4
        • 2.Qxe4#
      • 1...Sgf4
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(e);N_PINQ(C)::QAB(C)
    • S(g);N_PINQ(C)::QAB(C)
  • Tries
    • Try
      • K(B);N_SPINQ(C),P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • Q(k);::QAR(C)
        • S(e);::QAB(C)
        • S(g);::QAB(C)
      • Refutation
        • P(a);CHECK,XQ(C)
    • Try
      • K(B);N_SPINQ(C),P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • Q(k);::QAR(C)
        • S(e);::QAB(C)
        • S(g);::QAB(C)
      • Refutation
        • P(a);CHECK,XQ(C)
    • Try
      • B(H);CHECK,N_SPINQ(C),XR(i)
      • Refutation
        • Q(k);P_PINQ(C),XB(H)
    • Try
      • Q(C);P_PINP(b)
      • Threat
        • R(D)
      • Vars
        • S(e);N_PINQ(C)::QAB1(C),XP(b)
      • Refutation
        • S(g);N_PINQ(C)
    • Try
      • Q(C);
      • Threat
        • R(D)
      • Vars
        • S(g);N_PINQ(C)::QAR1(C),XP(d)
      • Refutation
        • S(e);N_PINQ(C)
    • Try
      • Q(C);CHECK,N_SPINQ(C),XR(i)
      • Vars
        • P(h);P_SPINP(h)::R(D)
      • Refutation
        • Q(k);CHECK,P_SPINQ(k),XQ(C)
  • Actual
    • Q(C);P_PINP(d)
    • Threat
      • R(D)
    • Vars
      • S(e);N_PINQ(C)::QAB1(C),XP(b)
      • S(g);N_PINQ(C)::QAR1(C),XP(d)
HTML5 logo

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).