MESON Chess Problem Database

Problem Display
PID: 235274 (1K2N3/RbP4r/1PkP4/P5R1/nrnp3P/B2PN2B/6P1/2Q5 w - - 0 1)

Hoffmann, Fritz

Schach, 1966

1K2N3/RbP4r/1PkP4/P5R1/nrnp3P/B2PN2B/6P1/2Q5

#2

15 + 7

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Bd7+?
      • 1...Kxd7
        • 2.c8Q#
      • 1...Rxd7!
    • 1.Rc5+?
      • 1...Kxc5
        • 2.Qxc4#
      • 1...Sxc5!
    • 1.Qxc4+?
      • 1...Sc5
        • 2.Rxc5#
        • 2.Qxc5#
      • 1...Rxc4!
    • 1.c8Q+?
      • 1...Rc7
        • 2.Bd7#
        • 2.Qxc7#
      • 1...Bxc8!
    • 1.c8R+?
      • 1...Rc7
        • 2.Rxc7#
      • 1...Bxc8!
  • Keys
    • 1.Sf5!
      • threat
        • 2.Sxd4#
      • 1...Kb5
        • 2.Sxd4#
      • 1...Kc5
        • 2.Qxc4#
      • 1...Kd5
        • 2.Se7#
      • 1...Kd7
        • 2.c8Q#
      • 1...Rxh4
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(F);CHECK
      • Vars
        • K(e);N_SPINS(c),S_FLIGHT,XB(F)::P=Q
      • Refutation
        • R(g);XB(F)
    • Try
      • R(I);CHECK,N_PINS(c)
      • Vars
        • K(e);P-FLIGHT,P_SPINR(b),P_SPINS(c),XR(I)::QAR1(A),XS(c)
      • Refutation
        • S(a);XR(I)
    • Try
      • Q(A);CHECK,XS(c)
      • Refutation
        • R(b);XQ(A)
    • Try
      • P(M);CHECK
      • Refutation
        • B(f);P_PINP(J),XQ(M)
    • Try
      • P(M);CHECK
      • Vars
        • R(g);N_GUARD,P_SPINR(g)::R1(M),XR(g)
      • Refutation
        • B(f);P_PINP(J),XR(M)
  • Actual
    • S(E);
    • Threat
      • S(E),XP(d)
    • Vars
      • K(e);N_SPINS(c),S_FLIGHT::R(I)+S(E),DCHECK,XP(d)
      • K(e);P-FLIGHT,P_SPINR(b)::QAR1(A),XS(c)
      • K(e);N_SPINS(c),S_FLIGHT::R(I)+S(E),DCHECK
      • K(e);N_SPINS(c),S_FLIGHT::P=Q
      • R(g);N_GUARD,XP(G)::S(E)
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