MESON Chess Problem Database

Problem Display
PID: 108798 (1N2R2b/1n1pp3/p2k4/8/1P1N1P2/pB5b/2Q5/Kn1R4 w - - 0 1)

Larsson, Lennart

Thema Danicum, 1992

1N2R2b/1n1pp3/p2k4/8/1P1N1P2/pB5b/2Q5/Kn1R4

#2

9 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd4+
      • 2.Rxd4#
    • 1...Sc3
      • 2.Sb5#
    • 1...Sa5
      • 2.Qc5#
    • 1...Sc5
      • 2.Qxc5#
    • 1...Sd8
      • 2.Qc5#
    • 1...e5
      • 2.Sb5#
      • 2.Sf5#
  • Tries
    • 1.Kxb1?
      • threat
        • 2.Sb5#
        • 2.Sf5#
      • 1...Bxd4
        • 2.Rxd4#
      • 1...Sc5
        • 2.Sb5#
        • 2.Qxc5#
      • 1...Bf5
        • 2.Sb5#
        • 2.Sxf5#
      • 1...a2+!
    • 1.Sxa6?
      • threat
        • 2.Qc7#
      • 1...Bxd4+
        • 2.Rxd4#
      • 1...Sc5
        • 2.Qxc5#
        • 2.bxc5#
      • 1...Sc3!
    • 1.Rc8?
      • threat
        • 2.Qc7#
      • 1...Bxd4+
        • 2.Rxd4#
      • 1...e5
        • 2.Sf5#
      • 1...Sc3
        • 2.Sb5#
        • 2.Sf5#
      • 1...Sc5
        • 2.Qxc5#
        • 2.bxc5#
      • 1...e6!
    • 1.Rxh8?
      • threat
        • 2.Sb5#
        • 2.Sf5#
      • 1...Sc3
        • 2.Sb5#
      • 1...Sc5
        • 2.Sb5#
        • 2.Qxc5#
      • 1...e5
        • 2.Sf5#
      • 1...e6
        • 2.Sf5#
      • 1...Bf5
        • 2.Sb5#
        • 2.Sxf5#
      • 1...Sd2!
    • 1.Qc3?
      • threat
        • 2.Sb5#
        • 2.Sf5#
      • 1...Bxd4
        • 2.Rxd4#
      • 1...Sxc3
        • 2.Sb5#
      • 1...Sc5
        • 2.Sb5#
        • 2.Qxc5#
      • 1...Bf5
        • 2.Sb5#
        • 2.Sxf5#
      • 1...Sd2!
  • Keys
    • 1.Rd8!
      • threat
        • 2.Qc6#
      • 1...Bxd4+
        • 2.Rxd4#
      • 1...Sxd8
        • 2.Qc5#
      • 1...Sc3
        • 2.Sb5#
      • 1...Sc5
        • 2.Qxc5#
      • 1...e5
        • 2.Sf5#
      • 1...e6
        • 2.Rxd7#
      • 1...Bg2
        • 2.Rxd7#
      • 1...Sa5
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(i);CHECK,OGATE,P_SPINB(i),XS(F)::R(B),XB(i)
    • S(a);N_PINS(F)::R(B)+S(F),DCHECK
    • S(f);N_GUARD::QAB1(C)
    • S(f);N_GUARD::QAB1(C),XS(f)
  • Tries
    • Try
      • K(A);N_SPINS(F),P-FLIGHT,XS(a)
      • Threat
        • DUALS(2)
      • Vars
        • B(i);OGATE,P_SPINB(i),XS(F)::R(B),XB(i)
      • Refutation
        • P(b);CHECK
    • Try
      • S(H);XP(d)
      • Threat
        • QAB1(C)
      • Vars
        • B(i);CHECK,OGATE,P_SPINB(i),XS(F)::R(B),XB(i)
      • Refutation
        • S(a);N_PINS(F)
    • Try
      • R(I);
      • Threat
        • QAB1(C)
      • Vars
        • B(i);CHECK,OGATE,P_SPINB(i),XS(F)::R(B),XB(i)
        • P(h);N_PINS(F)::R(B)+S(F),DCHECK
      • Refutation
        • P(h);
    • Try
      • R(I);N_SPINS(F),XB(i)
      • Threat
        • DUALS(2)
      • Vars
        • S(a);::R(B)+S(F),DCHECK
        • P(h);::R(B)+S(F),DCHECK
      • Refutation
        • S(a);
    • Try
      • Q(C);N_SPINS(F)
      • Threat
        • DUALS(2)
      • Vars
        • B(i);OGATE,P_PINQ(C),P_SPINB(i),XS(F)::R(B),XB(i)
        • S(a);XQ(C)::R(B)+S(F),DCHECK
      • Refutation
        • S(a);
  • Actual
    • R(I);P_PINP(g)
    • Threat
      • QAR1(C)
    • Vars
      • B(i);CHECK,OGATE,P_SPINB(i),XS(F)::R(B),XB(i)
      • S(f);N_GUARD,N_SPINP(g),XR(I)::QAB1(C)
      • S(a);N_PINS(F)::R(B)+S(F),DCHECK
      • S(f);N_GUARD::QAB1(C),XS(f)
      • P(h);N_PINS(F)::R(B)+S(F),DCHECK
      • P(h);S_CUTB(c)::R1(I),XP(g)
      • B(c);N_GUARD::R1(I),XP(g)
      • S(f);N_GUARD::QAB1(C)
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).