MESON Chess Problem Database

Problem Display
PID: 15250 (8/3P1KQB/1n3BN1/3p3b/n1pRN1kr/5pPp/7P/4q3 w - - 0 1)

Lender, Baruch

Schweizerische Arbeiter Schachzeitung, 1981

8/3P1KQB/1n3BN1/3p3b/n1pRN1kr/5pPp/7P/4q3

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Kf5
      • 2.Sd6#
    • 1...Qxg3
      • 2.Sxg3#
    • 1...Qb4
      • 2.Sd6#
    • 1...Qa5
      • 2.Sd6#
    • 1...Qf1
      • 2.Sd6#
    • 1...Qh1
      • 2.Sd6#
    • 1...Bxg6+
      • 2.Qxg6#
    • 1...Sc8
      • 2.dxc8Q#
      • 2.dxc8B#
  • Tries
    • 1.Ke6?
      • threat
        • 2.Se5#
      • 1...Qxg3
        • 2.Sf2#
        • 2.Sxg3#
      • 1...Bxg6
        • 2.Qxg6#
      • 1...Sc5+!
    • 1.Kf8?
      • threat
        • 2.Se5#
      • 1...Qb4+
        • 2.Sd6#
      • 1...Sxd7+
        • 2.Qxd7#
      • 1...Qxg3
        • 2.Sxg3#
      • 1...Bxg6
        • 2.Qxg6#
      • 1...Kf5!
    • 1.Kg8?
      • threat
        • 2.Se5#
      • 1...Qxg3
        • 2.Sxg3#
      • 1...Bxg6
        • 2.Qxg6#
      • 1...Kf5!
  • Keys
    • 1.Ke7!
      • threat
        • 2.Se5#
      • 1...Qb4+
        • 2.Sd6#
      • 1...Sc8+
        • 2.dxc8Q#
        • 2.dxc8B#
      • 1...Kf5
        • 2.Sxh4#
      • 1...Qxg3
        • 2.Sxg3#
      • 1...Bxg6
        • 2.Qxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 3
  • Sets
    • K(f);S_FLIGHT::S(D)
    • Q(a);XP(B)::R(C)+S(D),XQ(a)
    • Q(a);N_GUARD::R(C)+S(D)
    • B(i);CHECK,OGATE,P_SPINB(i),XS(F)::QAR2(I),XB(i)
    • S(j);OGATE::PXS(j)=Q
  • Tries
    • Try
      • K(H);N_SPINS(F),P_SPINS(D),S_FLIGHT
      • Threat
        • QAR(I)+S(F),DCHECK
      • Vars
        • B(i);OGATE,P_SPINB(i),XS(F)::QAR2(I),XB(i)
      • Refutation
        • S(d);CHECK
    • Try
      • K(H);N_SPINS(F),P-FLIGHT
      • Threat
        • QAR(I)+S(F),DCHECK
      • Vars
        • Q(a);CHECK,N_GUARD::R(C)+S(D)
        • S(j);CHECK,OGATE,XP(G)::QAB(I),XS(j)
        • Q(a);XP(B)::R(C)+S(D),XQ(a)
        • B(i);OGATE,P_SPINB(i),XS(F)::QAR2(I),XB(i)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • K(H);N_SPINS(F),S_FLIGHT
      • Threat
        • QAR(I)+S(F),DCHECK
      • Vars
        • Q(a);XP(B)::R(C)+S(D),XQ(a)
        • B(i);OGATE,P_SPINB(i),XS(F)::QAR2(I),XB(i)
      • Refutation
        • K(f);S_FLIGHT
  • Actual
    • K(H);N_SPINS(F),P-FLIGHT,P_SPINS(D)
    • Threat
      • QAR(I)+S(F),DCHECK
    • Vars
      • Q(a);CHECK,N_PINS(D)::R(C)+S(D)
      • S(j);CHECK,OGATE::PXS(j)=Q
      • K(f);S_FLIGHT::B(J)+S(F),DCHECK,XR(g)
      • Q(a);N_PINS(D),XP(B)::R(C)+S(D),XQ(a)
      • B(i);OGATE,P_SPINB(i),XS(F)::QAR2(I),XB(i)
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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).