MESON Chess Problem Database

Problem Display
PID: 261956 (BB6/3pK3/4n3/2Rr4/3k4/N1r1p1N1/b1PP4/b4Q2 w - - 0 1)

Knuppert, Hugo

Problemnoter, 1957

BB6/3pK3/4n3/2Rr4/3k4/N1r1p1N1/b1PP4/b4Q2

#2

9 + 8

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rb3
      • 2.Rc4#
      • 2.Rxd5#
      • 2.Qc4#
    • 1...Rc4
      • 2.Rxd5#
    • 1...Rcxc5
      • 2.Qd3#
    • 1...Rdxc5
      • 2.Se2#
    • 1...Bb1
      • 2.Rxd5#
    • 1...Sxc5
      • 2.Sb5#
  • Tries
    • 1.Be5+?
      • 1...Kxc5
        • 2.Qb5#
      • 1...Kxe5
        • 2.Qf6#
      • 1...Rxe5!
    • 1.Qc4+?
      • 1...Rxc4
        • 2.Rxd5#
      • 1...Bxc4!
    • 1.Qxa1?
      • threat
        • 2.Qxc3#
      • 1...Rxc5
        • 2.Se2#
      • 1...Bc4
        • 2.Rxc4#
      • 1...Kxc5!
    • 1.Qf4+?
      • 1...Kxc5
        • 2.Ba7#
      • 1...Sxf4!
    • 1.Qf6+?
      • 1...Re5
        • 2.Qxe5#
      • 1...Kxc5!
    • 1.dxc3+?
      • 1...Kxc5
        • 2.Ba7#
        • 2.Qb5#
      • 1...Bxc3!
  • Keys
    • 1.Ba7!
      • threat
        • 2.Rxd5#
      • 1...Ke5
        • 2.Qf6#
      • 1...Rcxc5
        • 2.Qxa1#
      • 1...Rdxc5
        • 2.Qf6#
      • 1...Sxc5
        • 2.Qf4#
      • 1...Re5
        • 2.Sb5#
        • 2.Se2#
        • 2.Rc4#
        • 2.Rd5#
      • 1...Rf5
        • 2.Sb5#
        • 2.Se2#
        • 2.Sxf5#
        • 2.Rd5#
      • 1...Rg5
        • 2.Sb5#
        • 2.Se2#
        • 2.Rd5#
      • 1...Rh5
        • 2.Sb5#
        • 2.Se2#
        • 2.Rd5#
      • 1...Rd6
        • 2.Sb5#
        • 2.Se2#
        • 2.Sf5#
        • 2.Rd5#
        • 2.Qf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • R(c);S_CUTB(b)::R1(F),XR(f)
    • R(c);N_GUARD,SBLOCK,XR(F)::QAR1(A)
    • R(f);SBLOCK,XR(F)::S(E)
    • B(b);N_GUARD::R1(F),XR(f)
    • S(g);SBLOCK,XR(F)::S(D)
  • Tries
    • Try
      • B(I);CHECK
      • Vars
        • K(e);N_GUARD,S_CUTR(f),S_FLIGHT,XR(F)::QAR1(A)
        • K(e);N_GUARD,P_SPINR(f),S_FLIGHT,XB(I)::QAB1(A)
      • Refutation
        • R(f);XB(I)
    • Try
      • Q(A);CHECK
      • Vars
        • R(c);XQ(A)::R1(F),XR(f)
      • Refutation
        • B(b);XQ(A)
    • Try
      • Q(A);P_PINR(c),XB(a)
      • Threat
        • QAB1(A),XR(c)
      • Vars
        • R(f);SBLOCK,XR(F)::S(E)
        • B(b);N_GUARD::R1(F),XB(b)
      • Refutation
        • K(e);N_SPINR(c),S_FLIGHT,XR(F)
    • Try
      • Q(A);CHECK
      • Vars
        • K(e);S_CUTS(g),S_FLIGHT,XR(F)::B(I)
      • Refutation
        • S(g);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::QAB1(A),XR(f)
      • Refutation
        • K(e);S_FLIGHT,XR(F)
    • Try
      • P(C);CHECK,XR(c)
      • Refutation
        • B(a);XP(C)
  • Actual
    • B(I);
    • Threat
      • B(I)+R(F),DCHECK,XR(f)
    • Vars
      • K(e);P_SPINR(f),S_FLIGHT::QAB1(A)
      • R(c);OGATEB,P_SPINR(c),XR(F)::QAB(A),XB(a)
      • R(f);N_GUARD,P_SPINR(f),XR(F)::QAB(A)
      • S(g);N_GUARD,P_SPINS(g),XR(F)::QAR2(A)
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