MESON Chess Problem Database

Problem Display
PID: 277890 (5n1b/1PR4B/K1NQ2rN/p5r1/4kp2/3R3b/2P3n1/8 w - - 0 1)

Morra, Juan Carlos

To Mat, 1957

5n1b/1PR4B/K1NQ2rN/p5r1/4kp2/3R3b/2P3n1/8

#2

9 + 9

15601 Albrecht-Leiss-Degener Collection 2024

SOLUTION

  • SOUND
  • Sets
    • 1...Rg3
      • 2.Qd5#
    • 1...Rg4
      • 2.Qd5#
    • 1...Rd5
      • 2.Qxd5#
    • 1...Re5
      • 2.Qd4#
    • 1...Bf5
      • 2.Qd5#
    • 1...Bd4
      • 2.Qxd4#
    • 1...Be5
      • 2.Qd5#
  • Tries
    • 1.Bxg6+?
      • 1...Rf5
        • 2.Qd5#
      • 1...Rxg6
        • 2.Qd5#
      • 1...Bf5
        • 2.Qd5#
      • 1...Sxg6!
    • 1.Qb4+?
      • 1...Bd4
        • 2.Qxd4#
      • 1...axb4!
  • Keys
    • 1.Se5!
      • threat
        • 2.Rc4#
      • 1...Bxe5
        • 2.Qc6#
      • 1...Be6
        • 2.Qd4#
      • 1...Se3
        • 2.Rd4#
      • 1...Se6
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • R(f);N_GUARD::QAB1(E)
    • R(f);N_GUARD::QAB1(E),XR(f)
    • R(f);S_CUTB(i)::QAR1(E)
    • B(b);N_SPINR(g),S_CUTR(f)::QAB1(E)
    • B(i);N_GUARD::QAR1(E),XB(i)
    • B(i);S_CUTR(f)::QAB1(E)
  • Tries
    • Try
      • B(I);CHECK,XR(g)
      • Vars
        • R(f);P_SPINR(f)::QAB1(E)
        • R(f);XB(I)::QAB1(E)
        • B(b);P_SPINB(b)::QAB1(E)
      • Refutation
        • S(h);XB(I)
    • Try
      • Q(E);CHECK,P_SPINS(D)
      • Vars
        • B(i);N_GUARD,P_SPINB(i)::QAR1(E),XB(i)
      • Refutation
        • P(e);XQ(E)
  • Actual
    • S(D);P_SPINQ(E)
    • Threat
      • R(H)
    • Vars
      • B(i);SBLOCK,XS(D)::QAB(E)
      • B(b);N_PINQ(E)::QAR1(E)
      • S(a);SBLOCK::R1(B)
      • S(h);N_PINQ(E)::QAB1(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).