MESON Chess Problem Database

Problem Display
PID: 225715 (8/3B1Nn1/b1r2p2/3k1p2/1P6/2PP1R1p/3Q4/5K2 w - - 0 1)

Pal, Julius

Praca, 1953

8/3B1Nn1/b1r2p2/3k1p2/1P6/2PP1R1p/3Q4/5K2

#2

8 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd3+
      • 2.Qxd3#
    • 1...Sh5
      • 2.Rxf5#
    • 1...Se6
      • 2.Rxf5#
    • 1...Se8
      • 2.Rxf5#
  • Tries
    • 1.Rf4?
      • threat
        • 2.Rd4#
      • 1...Bxd3+
        • 2.Qxd3#
      • 1...Rc4
        • 2.dxc4#
      • 1...Se6
        • 2.Rxf5#
      • 1...Rxc3!
  • Keys
    • 1.Qf4!
      • threat
        • 2.Qd4#
      • 1...Bxd3+
        • 2.Rxd3#
      • 1...Rxc3
        • 2.Qd6#
      • 1...Rc4
        • 2.Qd6#
      • 1...Se6
        • 2.Qxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • B(d);CHECK,OGATE,P_SPINB(d),XP(D)::QAR2(B),XB(d)
    • S(g);N_GUARD::R(E),XP(c)
  • Tries
    • Try
      • R(E);
      • Threat
        • R1(E)
      • Vars
        • B(d);CHECK,OGATE,P_SPINB(d),XP(D)::QAR2(B),XB(d)
        • R(e);N_PINP(D)::QAR(B)+P(D)DCHECK,XR(e)
        • S(g);N_GUARD::R(E),XP(c)
      • Refutation
        • R(e);XP(C)
  • Actual
    • Q(B);
    • Threat
      • QAR1(B)
    • Vars
      • B(d);CHECK,OGATE,XP(D)::R(E),XB(d)
      • R(e);N_GUARD,XP(C)::QAR1(B)
      • R(e);N_GUARD,N_PINP(D)::QAR1(B)
      • S(g);N_GUARD::QAR2(B),XP(c)
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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).