MESON Chess Problem Database

Problem Display
PID: 246667 (4B2b/1K2p1qb/p1N3rr/3P4/kB2R3/Np6/8/Q7 w - - 0 1)

Morra, Juan Carlos

El Ajedrez Espanol, 1962

4B2b/1K2p1qb/p1N3rr/3P4/kB2R3/Np6/8/Q7

#2

8 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...b2
      • 2.Qd1#
    • 1...e5+
      • 2.Be7#
    • 1...e6+
      • 2.Se7#
  • Tries
    • 1.Sb1+?
      • 1...Kb5
        • 2.Sa7#
        • 2.Qa5#
        • 2.Qxa6#
      • 1...Qxa1!
    • 1.Sc2+?
      • 1...Kb5
        • 2.Sa7#
        • 2.Qa5#
        • 2.Qxa6#
      • 1...Qxa1!
    • 1.Sc4+?
      • 1...Kb5
        • 2.Qa5#
        • 2.Qxa6#
      • 1...Qxa1!
    • 1.Sb5+?
      • 1...Kxb5
        • 2.Sa7#
        • 2.Qa5#
        • 2.Qxa6#
      • 1...Qxa1!
    • 1.Sd4+?
      • 1...Rc6
        • 2.Sac2#
      • 1...Kxb4!
  • Keys
    • 1.Qf1!
      • threat
        • 2.Qxa6#
      • 1...e5+
        • 2.Be7#
      • 1...e6+
        • 2.Se7#
      • 1...b2
        • 2.Qd1#
      • 1...a5
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATEB::QAB(A)
    • P(f);CHECK,S_CUTQ(g)::R(D)+B(C)
    • P(f);CHECK,S_CUTR(d)::B(H)+S(F)
  • Tries
    • Try
      • S(B);CHECK
      • Refutation
        • Q(g);XQ(A)
    • Try
      • S(B);CHECK
      • Refutation
        • Q(g);XQ(A)
    • Try
      • S(B);CHECK
      • Refutation
        • Q(g);XQ(A)
    • Try
      • S(B);CHECK
      • Refutation
        • Q(g);XQ(A)
    • Try
      • S(F);CHECK
      • Vars
        • R(d);P_SPINR(d)::QAR(A)+S(B)
      • Refutation
        • K(b);P-FLIGHT,XB(C)
  • Actual
    • Q(A);
    • Threat
      • QAR2(A),XP(c)
    • Vars
      • P(f);CHECK,S_CUTQ(g)::R(D)+B(C)
      • P(f);CHECK,S_CUTR(d)::B(H)+S(F)
      • P(a);OGATEB::QAB(A)
      • P(c);N_GUARD::QAB1(A)
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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).