MESON Chess Problem Database

Problem Display
PID: 178999 (KB6/3P4/p1p5/r3N3/1ppkbRQq/1PN1p3/1P2p2n/8 w - - 0 1)

Zaldo Zapirain, Juan

1st Prize, Magasinet, 1955

KB6/3P4/p1p5/r3N3/1ppkbRQq/1PN1p3/1P2p2n/8

#2

9 + 11

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rc5
      • 2.Rxe4#
    • 1...c5+
      • 2.Rxe4#
  • Tries
    • 1.Sxc6+?
      • 1...Kd3
        • 2.Qxe2#
      • 1...Kc5!
    • 1.Ba7+?
      • 1...Rc5
        • 2.Rxe4#
      • 1...c5+
        • 2.Rxe4#
      • 1...Kxe5!
    • 1.Qe6?
      • threat
        • 2.Qxc4#
      • 1...c5+
        • 2.Qd5#
      • 1...Kc5
        • 2.Ba7#
      • 1...cxb3
        • 2.Qc4#
      • 1...Rc5
        • 2.Sxe2#
      • 1...Rd5!
  • Keys
    • 1.Qxe2!
      • threat
        • 2.Qxc4#
      • 1...c5+
        • 2.Sc6#
      • 1...Kc5
        • 2.Qxe3#
      • 1...cxb3
        • 2.Qc4#
      • 1...Rc5
        • 2.Qd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(i);SBLOCK::R1(D),XB(g)
    • P(k);CHECK,SBLOCK::R1(D),XB(g)
  • Tries
    • Try
      • S(F);CHECK,P_SPINS(F),XP(k)
      • Vars
        • K(f);N_SPINB(g),P-FLIGHT::QAB1(E),XP(a)
      • Refutation
        • K(f);N_SPINB(g),S_FLIGHT
    • Try
      • B(I);CHECK
      • Vars
        • R(i);P_SPINR(i)::R1(D),XB(g)
        • P(k);CHECK,P_SPINP(k)::R1(D),XB(g)
      • Refutation
        • K(f);N_SPINB(g),S_FLIGHT,XS(F)
    • Try
      • Q(E);
      • Threat
        • QAR1(E),XP(e)
      • Vars
        • P(k);CHECK,N_GUARD,S_CUTR(i)::QAR1(E)
        • K(f);N_SPINB(g),S_FLIGHT::B(I)
        • P(e);XP(B)::QAR1(E)
        • R(i);SBLOCK::S(C),XP(a)
      • Refutation
        • R(i);
  • Actual
    • Q(E);XP(a)
    • Threat
      • QAR1(E),XP(e)
    • Vars
      • P(k);CHECK,SBLOCK::S(F)
      • K(f);N_SPINB(g),S_FLIGHT::QAB(E),XP(c)
      • P(e);XP(B)::QAR1(E)
      • R(i);SBLOCK::QAR(E)
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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).