MESON Chess Problem Database

Problem Display
PID: 102001 (B3Qn2/1N4qp/7r/1P1kP1p1/3P4/3PP2p/5RpK/2r3B1 w - - 0 1)

Casa, Alex

1st Prize, Themes-64, 1970

B3Qn2/1N4qp/7r/1P1kP1p1/3P4/3PP2p/5RpK/2r3B1

#2

11 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe5+
      • 2.Qxe5#
  • Tries
    • 1.Sc5+?
      • 1...Rc6
        • 2.Bxc6#
        • 2.Qxc6#
      • 1...Qb7!
    • 1.Sd6+?
      • 1...Rc6
        • 2.Bxc6#
      • 1...Qb7!
    • 1.Rc2?
      • threat
        • 2.e4#
      • 1...Qxe5+
        • 2.Qxe5#
      • 1...Rxg1
        • 2.Rc5#
      • 1...Qg6
        • 2.Sd6#
      • 1...Re1
        • 2.Rc5#
      • 1...Rh4
        • 2.Qc6#
      • 1...Qe7!
    • 1.Rf7?
      • threat
        • 2.e4#
      • 1...Qxe5+
        • 2.Qxe5#
      • 1...Rxg1
        • 2.Sd6#
      • 1...Re1
        • 2.Sd6#
      • 1...Rh4
        • 2.Sc5#
      • 1...Qg6!
    • 1.Qf7+?
      • 1...Re6
        • 2.Sc5#
        • 2.Qf3#
      • 1...Se6
        • 2.Sc5#
        • 2.Qf3#
      • 1...Qxf7!
  • Keys
    • 1.Rf6!
      • threat
        • 2.e4#
      • 1...Rxg1
        • 2.Qc6#
      • 1...Qg6
        • 2.Sc5#
      • 1...Re1
        • 2.Qc6#
      • 1...Rh4
        • 2.Rd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(g);CHECK,OGATE,XP(H)::QAR1(K),XQ(g)
  • Tries
    • Try
      • S(I);CHECK
      • Refutation
        • Q(g);P_SPINQ(g)
    • Try
      • S(I);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::B(J),XR(a)
      • Refutation
        • Q(g);P_SPINQ(g)
    • Try
      • R(B);
      • Threat
        • P(E)
      • Vars
        • Q(g);CHECK,OGATE,XP(H)::QAR1(K),XQ(g)
        • R(a);N_GUARD,XB(A)::R1(B)
        • Q(g);N_GUARD::B(J)+S(I)
        • R(a);N_GUARD::R1(B)
        • R(f);N_GUARD::QAB1(K)
      • Refutation
        • Q(g);
    • Try
      • R(B);
      • Threat
        • P(E)
      • Vars
        • Q(g);CHECK,OGATE,XP(H)::QAR1(K),XQ(g)
        • R(a);N_GUARD,XB(A)::B(J)+S(I)
        • R(a);N_GUARD::B(J)+S(I)
        • R(f);N_GUARD::B(J)+S(I)
      • Refutation
        • Q(g);
    • Try
      • Q(K);CHECK
      • Refutation
        • Q(g);XQ(K)
  • Actual
    • R(B);
    • Threat
      • P(E)
    • Vars
      • R(a);N_GUARD,XB(A)::QAB1(K)
      • Q(g);N_GUARD::B(J)+S(I)
      • R(a);N_GUARD::QAB1(K)
      • R(f);N_GUARD::R1(B)
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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).