MESON Chess Problem Database

Problem Display
PID: 261299 (1qRN4/2n1K3/nP1N3R/r2k1p1r/3p4/1P6/Bb3B2/4Q3 w - - 0 1)

Hannelius, Jan Ingvar

Heikkila, Raimo

Neue Zurcher Zeitung, 1985

1qRN4/2n1K3/nP1N3R/r2k1p1r/3p4/1P6/Bb3B2/4Q3

#2

10 + 9

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kc5
      • 2.Qxa5#
    • 1...Rb5
      • 2.b4#
    • 1...Ba3
      • 2.b4#
    • 1...Sb5
      • 2.Qe6#
    • 1...Se6
      • 2.Qxe6#
    • 1...Sa8
      • 2.Qe6#
    • 1...Se8
      • 2.Qe6#
    • 1...f4
      • 2.Rxh5#
  • Tries
    • 1.Sc4?
      • threat
        • 2.Qe5#
      • 1...Kc5
        • 2.Qxa5#
      • 1...Sb5
        • 2.Qe6#
      • 1...Se6
        • 2.Qxe6#
      • 1...Sa8
        • 2.Qe6#
      • 1...Se8
        • 2.Qe6#
      • 1...d3
        • 2.Rd6#
      • 1...f4
        • 2.Rxh5#
      • 1...Ba3+!
    • 1.Bg3?
      • threat
        • 2.Qe5#
      • 1...Kc5
        • 2.Qxa5#
      • 1...f4
        • 2.Rxh5#
      • 1...d3!
    • 1.Rxh5?
      • threat
        • 2.Rxf5#
      • 1...Kc5
        • 2.Qxa5#
      • 1...d3
        • 2.Qe4#
      • 1...Qxc8!
    • 1.Qe4+?
      • 1...fxe4
        • 2.Rxh5#
      • 1...Kc5!
  • Keys
    • 1.S6f7!
      • threat
        • 2.Qe5#
      • 1...Ba3+
        • 2.b4#
      • 1...Kc5
        • 2.Qxa5#
      • 1...Sb5
        • 2.Qe6#
      • 1...Se6
        • 2.Qxe6#
      • 1...Sa8
        • 2.Qe6#
      • 1...Se8
        • 2.Qe6#
      • 1...d3
        • 2.Rd6#
      • 1...f4
        • 2.Rxh5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(d);P-FLIGHT,P_SPINP(b),P_SPINS(h),S_CUTS(g)::QAR2(A),XR(c)
    • R(c);N_GUARD::B(B)+P(D)
    • B(a);P_PINS(F),S_CUTR(c)::B(B)+P(D)
    • S(h);N_GUARD::QAB1(A)
    • S(h);N_GUARD::QAB1(A),XS(h)
    • P(e);OGATEB::R(G),XR(f)
  • Tries
    • Try
      • S(F);
      • Threat
        • QAR1(A)
      • Vars
        • K(d);N_GUARD,P-FLIGHT,P_SPINP(b),P_SPINS(h),S_CUTS(g)::QAR2(A),XR(c)
        • S(h);N_GUARD::QAB1(A)
        • S(h);N_GUARD::QAB1(A),XS(h)
        • P(b);::R1(G)
        • P(e);OGATEB::R(G),XR(f)
      • Refutation
        • B(a);CHECK
    • Try
      • B(C);
      • Threat
        • QAR1(A)
      • Vars
        • K(d);P-FLIGHT,P_SPINS(h),S_CUTS(g)::QAR2(A),XR(c)
        • P(e);OGATEB::R(G),XR(f)
      • Refutation
        • P(b);
    • Try
      • R(G);P_PINP(e),XR(f)
      • Threat
        • R(G),XP(e)
      • Vars
        • K(d);N_SPINP(e),P-FLIGHT,P_SPINP(b),P_SPINS(h),S_CUTS(g)::QAR2(A),XR(c)
        • P(b);::QAB1(A)
      • Refutation
        • Q(i);XR(I)
    • Try
      • Q(A);CHECK
      • Vars
        • P(e);XQ(A)::R(G),XR(f)
      • Refutation
        • K(d);P-FLIGHT,P_SPINP(b),P_SPINS(h)
  • Actual
    • S(F);
    • Threat
      • QAR1(A)
    • Vars
      • B(a);CHECK,S_CUTR(c)::B(B)+P(D)
      • K(d);N_GUARD,P-FLIGHT,P_SPINP(b),P_SPINS(h),S_CUTS(g)::QAR2(A),XR(c)
      • S(h);N_GUARD::QAB1(A)
      • S(h);N_GUARD::QAB1(A),XS(h)
      • P(b);::R1(G)
      • P(e);OGATEB::R(G),XR(f)
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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).