MESON Chess Problem Database

Problem Display
PID: 84835 (8/8/N7/1p2p3/1r1kP3/Qpb1pP2/1P1pK3/3R1B2 w - - 0 1)

Petite, Efren

Die Schwalbe, 1957

8/8/N7/1p2p3/1r1kP3/Qpb1pP2/1P1pK3/3R1B2

#2

8 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Kxe3#
    • 1...Ra4
      • 2.Qc5#
    • 1...Rc4
      • 2.Qd6#
    • 1...Bxb2
      • 2.Qxb4#
  • Tries
    • 1.Bg2?
      • 1...Bxb2
        • 2.Qxb4#
      • 1...Ra4
        • 2.Qc5#
      • 1...Rc4
        • 2.Qd6#
      • 1...Kc4!
    • 1.Bh3?
      • 1...Bxb2
        • 2.Qxb4#
      • 1...Ra4
        • 2.Qc5#
      • 1...Rc4
        • 2.Qd6#
      • 1...Kc4!
    • 1.bxc3+?
      • 1...Kc4
        • 2.Qxb4#
      • 1...Kxc3!
  • Keys
    • 1.Qa5!
      • 1...Kc4
        • 2.Kxe3#
      • 1...Bxb2
        • 2.Qxb4#
      • 1...Ra4
        • 2.Qxc3#
      • 1...Rc4
        • 2.Qd8#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(f);N_SPINP(a),P-FLIGHT::B(B)+K(D),XP(d)
    • R(e);OGATE::QAB1(E)
    • R(e);OGATE,SBLOCK::QAR2(E)
    • B(c);N_GUARD,XP(C)::QAR2(E),XR(e)
  • Tries
    • Try
      • B(B);
      • Vars
        • B(c);N_GUARD,XP(C)::QAR2(E),XR(e)
        • R(e);OGATE::QAB1(E)
        • R(e);OGATE,SBLOCK::QAR2(E)
      • Refutation
        • K(f);N_SPINP(a),P-FLIGHT
    • Try
      • B(B);
      • Vars
        • B(c);N_GUARD,XP(C)::QAR2(E),XR(e)
        • R(e);OGATE::QAB1(E)
        • R(e);OGATE,SBLOCK::QAR2(E)
      • Refutation
        • K(f);N_SPINP(a),P-FLIGHT
    • Try
      • P(C);CHECK,XB(c)
      • Vars
        • K(f);N_SPINP(a),P-FLIGHT::QAR1(E),XR(e)
      • Refutation
        • K(f);N_SPINP(a),P_SPINP(b),S_FLIGHT,XP(C)
  • Actual
    • Q(E);
    • Vars
      • K(f);N_SPINP(a),P-FLIGHT::B(B)+K(D),XP(d)
      • B(c);N_GUARD,XP(C)::QAR2(E),XR(e)
      • R(e);OGATE::QAB1(E),XB(c)
      • R(e);SBLOCK::QAR(E)
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).