MESON Chess Problem Database

Problem Display
PID: 54011 (B2n2K1/1R4p1/8/2Qr3N/6p1/5kNp/bRnB4/8 w - - 0 1)

Lubell, Martin S

Chess Life, 1956

B2n2K1/1R4p1/8/2Qr3N/6p1/5kNp/bRnB4/8

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd2+
      • 2.R7b3#
      • 2.Rf7#
    • 1...Rd3+
      • 2.Rf7#
    • 1...Rd4+
      • 2.Rf7#
    • 1...Rxc5+
      • 2.Rf7#
    • 1...Re5+
      • 2.R7b3#
      • 2.Rf7#
    • 1...Rf5+
      • 2.R7b3#
    • 1...Rg5+
      • 2.R7b3#
      • 2.Rf7#
    • 1...Rxh5+
      • 2.R7b3#
    • 1...Rd6+
      • 2.R7b3#
      • 2.Rf7#
    • 1...Rd7+
      • 2.R7b3#
  • Tries
    • 1.Rf7+?
      • 1...Kg2
        • 2.Qf2#
      • 1...Sxf7!
  • Keys
    • 1.Be1!
      • threat
        • 2.Qf2#
      • 1...Rd1+
        • 2.R7b3#
        • 2.Rf7#
      • 1...Rd2+
        • 2.R7b3#
        • 2.Rf7#
      • 1...Rd3+
        • 2.Rf7#
      • 1...Rd4+
        • 2.R7b3#
      • 1...Rxc5+
        • 2.R7b3#
      • 1...Re5+
        • 2.R7b3#
        • 2.Rf7#
      • 1...Rf5+
        • 2.R7b3#
      • 1...Rg5+
        • 2.R7b3#
        • 2.Rf7#
      • 1...Rxh5+
        • 2.Rf7#
      • 1...Rd6+
        • 2.R7b3#
        • 2.Rf7#
      • 1...Rd7+
        • 2.R7b3#
      • 1...Kg2
        • 2.Qf2#
      • 1...Se3
        • 2.Rf2#
      • 1...Sd4
        • 2.Qc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(f);CHECK::B(G)+R(F),DCHECK
    • R(f);CHECK,XQ(D)::B(G)+R(F),DCHECK
    • R(f);CHECK,XS(E)::B(G)+R(F),DCHECK
  • Tries
    • Try
      • R(F);CHECK,P_PINR(f)
      • Vars
        • K(c);S_FLIGHT::QAR1(D)
      • Refutation
        • S(h);XR(F)
  • Actual
    • B(B);
    • Threat
      • QAR1(D)
    • Vars
      • R(f);CHECK::B(G)+R(F),DCHECK
      • R(f);CHECK,XQ(D)::B(G)+R(F),DCHECK
      • R(f);CHECK,XS(E)::B(G)+R(F),DCHECK
      • K(c);P_SPINS(b),S_FLIGHT::QAR1(D)
      • S(b);OGATE::R1(A)
      • S(b);N_GUARD,S_CUTR(f)::QAR(D)
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