MESON Chess Problem Database

Problem Display
PID: 242350 (1qn5/Rb6/1p1k4/4p2p/1N1PP2B/4p1KB/8/2Q5 w - - 0 1)

Morra, Juan Carlos

Magyar Sakkelet, 1958

1qn5/Rb6/1p1k4/4p2p/1N1PP2B/4p1KB/8/2Q5

#2

8 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bxe4
      • 2.Rd7#
    • 1...Bd5
      • 2.Rd7#
    • 1...Ba6
      • 2.Rd7#
      • 2.Qc6#
    • 1...Bc6
      • 2.Qxc6#
    • 1...Ba8
      • 2.Rd7#
    • 1...b5
      • 2.Qc5#
  • Tries
    • 1.Sd3?
      • threat
        • 2.dxe5#
      • 1...Bxe4
        • 2.Rd7#
      • 1...exd4!
    • 1.Sd5?
      • 1...Qxa7
        • 2.Qc7#
      • 1...Bxd5
        • 2.Rd7#
      • 1...Sxa7
        • 2.Be7#
      • 1...Qc7
        • 2.Qxc7#
      • 1...Qa8
        • 2.Qc7#
      • 1...Ba6
        • 2.Rd7#
      • 1...Bc6
        • 2.Qa3#
      • 1...Ba8
        • 2.Rd7#
      • 1...Se7
        • 2.Bxe7#
      • 1...e2
        • 2.Qh6#
      • 1...b5
        • 2.Qc5#
      • 1...exd4!
    • 1.Bf6?
      • threat
        • 2.dxe5#
      • 1...exd4
        • 2.e5#
      • 1...h4+!
  • Keys
    • 1.Ra5!
      • threat
        • 2.dxe5#
      • 1...exd4
        • 2.e5#
      • 1...bxa5
        • 2.Qc5#
      • 1...Bc6
        • 2.Qxc6#
      • 1...Bd5
        • 2.Rxd5#
      • 1...b5
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • B(f);OGATE,XP(F)::R1(H)
    • B(f);OGATE::R1(H)
    • B(f);N_GUARD::QAR1(A),XB(f)
    • P(d);N_GUARD::QAB1(A)
  • Tries
    • Try
      • S(D);
      • Threat
        • P(E),XP(b)
      • Vars
        • B(f);OGATE,XP(F)::R1(H)
      • Refutation
        • P(b);XP(E)
    • Try
      • S(D);
      • Vars
        • Q(g);N_GUARD,XR(H)::QAB1(A)
        • B(f);OGATE,XS(D)::R1(H)
        • S(h);N_GUARD,XR(H)::B(G)
        • Q(g);N_GUARD::QAB1(A),XQ(g)
        • Q(g);N_GUARD::QAB1(A)
        • B(f);OGATE::R1(H)
        • B(f);SBLOCK::QAB(A)
        • S(h);N_GUARD::B(G),XS(h)
        • P(a);OGATE::QAR(A)
        • P(d);N_GUARD::QAB1(A)
      • Refutation
        • P(b);XP(E)
    • Try
      • B(G);
      • Threat
        • P(E),XP(b)
      • Vars
        • P(b);OGATE,XP(E)::P(F)
      • Refutation
        • P(c);CHECK
  • Actual
    • R(H);
    • Threat
      • P(E),XP(b)
    • Vars
      • P(b);OGATE,XP(E)::P(F)
      • P(d);N_GUARD,XR(H)::QAB1(A)
      • B(f);N_GUARD::QAR1(A),XB(f)
      • B(f);N_GUARD::R1(H),XB(f)
      • P(d);N_GUARD::QAB1(A)
HTML5 logo

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).