MESON Chess Problem Database

Problem Display
PID: 270869 (6nr/n3r1p1/qP1Pk2p/1pP1N3/8/2P2Q2/3K4/1B2R3 w - - 0 1)

Grunfeld, Max

Schackvarlden, 1939

6nr/n3r1p1/qP1Pk2p/1pP1N3/8/2P2Q2/3K4/1B2R3

#2

9 + 9

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Qc8
      • 2.Ba2#
    • 1...Qa2+
      • 2.Bxa2#
    • 1...Qxb6
      • 2.Ba2#
    • 1...Rd7
      • 2.Sd3#
      • 2.Sc4#
      • 2.Sg4#
      • 2.Sc6#
      • 2.Sg6#
      • 2.Sf7#
    • 1...Rf7
      • 2.Qxf7#
    • 1...Re8
      • 2.Qf7#
    • 1...Sf6
      • 2.Bf5#
  • Tries
    • 1.Be4?
      • threat
        • 2.Bd5#
        • 2.Qf5#
      • 1...Kxe5
        • 2.Bb1#
        • 2.Bc2#
        • 2.Bd3#
        • 2.Bd5#
        • 2.Bc6#
        • 2.Bg6#
        • 2.Bb7#
        • 2.Bh7#
        • 2.Ba8#
        • 2.Qf5#
      • 1...Qb7
        • 2.Qf5#
      • 1...Rf7
        • 2.Bd5#
      • 1...Sf6
        • 2.Bf5#
        • 2.Qf5#
      • 1...g6
        • 2.Bd5#
      • 1...Qa2+!
    • 1.Qg4+?
      • 1...Kf6
        • 2.Qf5#
        • 2.Qg6#
      • 1...Kd5!
    • 1.Qd5+?
      • 1...Kf6
        • 2.Sg4#
      • 1...Kxd5!
    • 1.Qh3+?
      • 1...Kf6
        • 2.Qf5#
      • 1...Kd5!
  • Keys
    • 1.d7!
      • threat
        • 2.d8S#
      • 1...Qa2+
        • 2.Bxa2#
      • 1...Rxd7+
        • 2.Sd3#
      • 1...Qxb6
        • 2.Ba2#
      • 1...Rf7
        • 2.Qxf7#
      • 1...Re8
        • 2.Qf7#
      • 1...Qc8
        • 2.Ba2#
      • 1...Sc6
        • 2.Qxc6#
      • 1...Sf6
        • 2.Bf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(b);N_GUARD::B(A)
    • Q(b);CHECK,N_GUARD::B(A),XQ(b)
    • Q(b);N_GUARD,XP(H)::B(A)
    • R(f);N_GUARD::QAB1(E),XR(f)
    • R(f);N_GUARD::QAB1(E)
    • S(h);SBLOCK::B(A)
  • Tries
    • Try
      • B(A);
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);::QAB1(E)
        • R(f);::B(A)
        • P(g);::B(A)
      • Refutation
        • Q(b);CHECK
    • Try
      • Q(E);CHECK
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(c);N_GUARD,P-FLIGHT::S(G)
      • Refutation
        • K(c);S_FLIGHT,XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • K(c);N_GUARD,P-FLIGHT::QAR1(E)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • P(I);
    • Threat
      • P=S
    • Vars
      • Q(b);CHECK,N_GUARD::B(A),XQ(b)
      • R(f);CHECK,SBLOCK,XP(I)::R(B)+S(G)
      • Q(b);N_GUARD,XP(H)::B(A)
      • R(f);N_GUARD::QAB1(E),XR(f)
      • R(f);N_GUARD::QAB1(E)
      • Q(b);N_GUARD::B(A)
      • S(e);N_GUARD::QAR2(E),XS(e)
      • S(h);SBLOCK::B(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).