MESON Chess Problem Database

Problem Display
PID: 269366 (4RrB1/K2Qprb1/3p1p1n/3k1b1R/2p1N3/2p1BP2/8/1n6 w - - 0 1)

Grevlund, Per

2nd Prize, Postsjakk, 1974

4RrB1/K2Qprb1/3p1p1n/3k1b1R/2p1N3/2p1BP2/8/1n6

#2

8 + 12

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Qxd6#
    • 1...e5
      • 2.Qb7#
  • Tries
    • 1.Sxc3+?
      • 1...Ke5
        • 2.f4#
      • 1...Sxc3!
    • 1.Rxf5+?
      • 1...e5
        • 2.Qb7#
      • 1...Sxf5!
    • 1.Rxe7?
      • threat
        • 2.Qb5#
        • 2.Qxd6#
        • 2.Qb7#
      • 1...Rb8
        • 2.Qxd6#
      • 1...Rc8
        • 2.Qxd6#
      • 1...Rd8
        • 2.Qb5#
        • 2.Qb7#
      • 1...Sa3
        • 2.Sxc3#
        • 2.Qxd6#
        • 2.Qb7#
      • 1...Ra8+!
    • 1.Qc6+?
      • 1...Ke5
        • 2.Qxd6#
      • 1...Ke6
        • 2.Qxd6#
      • 1...Kxc6!
    • 1.Qb7+?
      • 1...Ke6
        • 2.Rxe7#
      • 1...Ke5!
  • Keys
    • 1.Sxd6!
      • threat
        • 2.Sxf7#
      • 1...Ke5
        • 2.Sxc4#
      • 1...exd6
        • 2.Qb7#
      • 1...e5
        • 2.Sxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(d);N_SPINP(f),N_SPINR(j),P-FLIGHT,P_SPINP(i)::QAB1(F),XP(f)
    • P(i);N_SPINB(e),P_PINQ(F)::QAB(F)
  • Tries
    • Try
      • S(C);CHECK,XP(b)
      • Vars
        • K(d);N_SPINP(f),N_SPINR(j),P-FLIGHT,P_SPINP(i),S_CUTS(a)::P(B)
      • Refutation
        • S(a);XS(C)
    • Try
      • R(D);CHECK,XB(e)
      • Vars
        • P(i);N_SPINP(f),P_PINQ(F),P_SPINP(i)::QAB(F)
      • Refutation
        • S(h);XR(D)
    • Try
      • R(G);XP(i)
      • Threat
        • DUALS(3)
      • Vars
        • R(l);::QAR1(F),XP(f)
      • Refutation
        • R(l);CHECK
    • Try
      • Q(F);CHECK,N_PINP(f)
      • Vars
        • K(d);N_SPINR(j),P-FLIGHT,P_SPINP(i)::QAB1(F),XP(f)
        • K(d);N_SPINB(e),P_SPINP(f),S_CUTP(i),S_FLIGHT::QAR1(F),XP(f)
      • Refutation
        • K(d);N_SPINB(e),N_SPINR(j),S_FLIGHT,XQ(F)
    • Try
      • Q(F);CHECK,N_PINP(f)
      • Vars
        • K(d);N_SPINB(e),P_SPINP(i),S_FLIGHT::R1(G),XP(i)
      • Refutation
        • K(d);N_SPINR(j),P-FLIGHT,P_SPINP(i)
  • Actual
    • S(C);XP(f)
    • Threat
      • QAR(F)+S(C),XR(j)
    • Vars
      • K(d);N_GUARD,N_SPINR(j),P-FLIGHT,P_SPINP(i)::S(C),XP(c)
      • P(i);P_PINQ(F),P_SPINP(i),SBLOCK,XS(C)::QAB(F)
      • P(i);N_SPINB(e),P_PINQ(F)::QAR(F)+S(C),XB(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).