MESON Chess Problem Database

Problem Display
PID: 168234 (4B3/2P1p3/1P2rp2/3k1N2/4bq2/2bNR3/KB3P2/n1RQ4 w - - 0 1)

Petite, Efren

Problem (Zagreb), 1976

4B3/2P1p3/1P2rp2/3k1N2/4bq2/2bNR3/KB3P2/n1RQ4

#2

11 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Be1
      • 2.Sb4#
      • 2.Sxf4#
      • 2.Rc5#
    • 1...Bxb2
      • 2.Rc5#
    • 1...Bd2
      • 2.Sb4#
      • 2.Sxf4#
      • 2.Rc5#
    • 1...Bb4
      • 2.Sxb4#
      • 2.Sxf4#
    • 1...Ba5
      • 2.Sb4#
      • 2.Sxf4#
      • 2.Rc5#
    • 1...Be5
      • 2.Sb4#
      • 2.Sxf4#
      • 2.Rc5#
    • 1...Sb3
      • 2.Qxb3#
  • Tries
    • 1.Sxf4+?
      • 1...Kc4
        • 2.Qd4#
      • 1...Kc5
        • 2.Qd4#
      • 1...Ke5!
    • 1.Sxe7+?
      • 1...Kc4
        • 2.Qa4#
      • 1...Kd4
        • 2.Qa4#
      • 1...Kd6
        • 2.c8S#
      • 1...Rxe7!
  • Keys
    • 1.Sb4+!
      • 1...Kc4
        • 2.Qd4#
      • 1...Kc5
        • 2.Qd4#
      • 1...Ke5
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • B(b);OGATE,XB(D)::R1(A)
    • S(a);N_GUARD::QAB(B),XS(a)
  • Tries
    • Try
      • S(F);CHECK,XQ(d)
      • Vars
        • K(e);P_SPINB(b),S_FLIGHT::QAR1(B)
        • K(e);P-FLIGHT,P_SPINB(b)::QAB1(B)
      • Refutation
        • K(e);P-FLIGHT,P_SPINB(b)
    • Try
      • S(H);CHECK,XP(h)
      • Vars
        • K(e);P_SPINB(b),S_FLIGHT::QAR2(B)
        • K(e);P-FLIGHT,P_SPINB(b)::QAR(B)
        • K(e);P-FLIGHT::P=S
      • Refutation
        • R(f);XS(H)
  • Actual
    • S(F);CHECK
    • Vars
      • K(e);P_SPINB(b),S_FLIGHT::QAR1(B)
      • K(e);P-FLIGHT,P_SPINB(b)::QAB1(B)
      • K(e);P-FLIGHT,P_SPINB(b)::QAR1(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).