MESON Chess Problem Database

Problem Display
PID: 186871 (8/5p2/n7/3B1pp1/5kp1/R3N3/6Q1/B1bK3n w - - 0 1)

Shire, David J

Problem Observer, 2018

8/5p2/n7/3B1pp1/5kp1/R3N3/6Q1/B1bK3n

#2

6 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sf2+
      • 2.Qxf2#
    • 1...Sg3
      • 2.Qf2#
    • 1...g3
      • 2.Qf3#
  • Tries
    • 1.Sc4?
      • threat
        • 2.Be5#
      • 1...Sf2+
        • 2.Qxf2#
      • 1...g3
        • 2.Qf3#
      • 1...Bb2
        • 2.Qd2#
      • 1...f6!
    • 1.Sxg4?
      • threat
        • 2.Be5#
        • 2.Rf3#
        • 2.Qf3#
      • 1...Bxa3
        • 2.Be5#
        • 2.Qf3#
      • 1...fxg4
        • 2.Qe4#
      • 1...Sg3
        • 2.Qf3#
        • 2.Qxg3#
      • 1...Bb2
        • 2.Rf3#
        • 2.Qf3#
      • 1...Be3
        • 2.Be5#
        • 2.Qf3#
      • 1...f6
        • 2.Rf3#
        • 2.Qf3#
      • 1...Sf2+!
    • 1.Sxf5?
      • threat
        • 2.Qe4#
      • 1...Sf2+
        • 2.Qxf2#
      • 1...Kxf5
        • 2.Qe4#
      • 1...Sg3
        • 2.Qf2#
      • 1...Sc5!
    • 1.Ra4+?
      • 1...Kxe3
        • 2.Qe2#
      • 1...Sb4!
    • 1.Qf1+?
      • 1...Sf2+
        • 2.Qxf2#
      • 1...Kg3!
    • 1.Qh2+?
      • 1...Sg3
        • 2.Sg2#
        • 2.Qf2#
      • 1...g3!
    • 1.Qg3+?
      • 1...Sxg3
        • 2.Sg2#
      • 1...Kxg3!
  • Keys
    • 1.Qd2!
      • threat
        • 2.Sg2#
      • 1...Sf2+
        • 2.Qxf2#
      • 1...Kg3
        • 2.Sxf5#
      • 1...Bxa3
        • 2.Sf1#
      • 1...Bb2
        • 2.Sc4#
      • 1...g3
        • 2.Qd4#

This is a version of 16877

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • S(b);CHECK,N_GUARD::QAR2(C),XS(b)
    • S(b);N_GUARD::QAR2(C)
    • P(d);N_GUARD::QAR1(C)
  • Tries
    • Try
      • S(E);
      • Threat
        • B(A)
      • Vars
        • S(b);CHECK,N_GUARD::QAR2(C),XS(b)
        • P(d);N_GUARD::QAR1(C)
        • B(a);N_GUARD::QAB(C)
      • Refutation
        • P(h);
    • Try
      • S(E);XP(d)
      • Threat
        • DUALS(3)
      • Vars
        • P(e);N_GUARD,SBLOCK,XS(E)::QAR1(C)
      • Refutation
        • S(b);CHECK
    • Try
      • S(E);XP(e)
      • Threat
        • QAR1(C)
      • Vars
        • S(b);CHECK,N_GUARD::QAR2(C),XS(b)
        • K(c);P-FLIGHT,XS(E)::QAB1(C)
        • S(b);N_GUARD::QAR2(C)
      • Refutation
        • S(g);
    • Try
      • R(D);CHECK
      • Vars
        • K(c);S_FLIGHT,XS(E)::QAR1(C)
      • Refutation
        • S(g);P_SPINS(g)
    • Try
      • Q(C);CHECK
      • Vars
        • S(b);CHECK,N_GUARD,P_SPINS(b)::QAR2(C),XS(b)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Refutation
        • P(d);P_SPINP(d)
    • Try
      • Q(C);CHECK
      • Vars
        • S(b);XQ(C)::S(E)
      • Refutation
        • K(c);S_FLIGHT,XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAB(C)+S(E),DCHECK
    • Vars
      • S(b);CHECK,N_GUARD::QAR2(C),XS(b)
      • K(c);S_FLIGHT::R(D)+S(E),DCHECK,XP(e)
      • B(a);N_GUARD,XR(D)::QAB(C)+S(E)
      • B(a);N_GUARD::QAB(C)+S(E)
      • P(d);SBLOCK::QAR2(C)
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).