MESON Chess Problem Database

Problem Display
PID: 54025 (1b6/1Q4B1/8/4r2p/1N6/p2N1pR1/rn3R1K/k7 w - - 0 1)

Lies, Heinz

3rd HM., Schach-Echo, 1933

1b6/1Q4B1/8/4r2p/1N6/p2N1pR1/rn3R1K/k7

#2

7 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Ra5
      • 2.Rf1#
    • 1...Rb5
      • 2.Rf1#
    • 1...Rd5
      • 2.Rf1#
    • 1...Rf5
      • 2.Rf1#
    • 1...Rg5
      • 2.Rf1#
    • 1...Sa4
      • 2.Rg1#
    • 1...Sc4
      • 2.Rg1#
  • Tries
    • 1.Rf1+?
      • 1...Re1
        • 2.Rxe1#
      • 1...Sd1+!
    • 1.Rg1+?
      • 1...Sd1
        • 2.Rxd1#
      • 1...Re1+!
    • 1.Qf7?
      • threat
        • 2.Qxa2#
      • 1...Kb1
        • 2.Qxa2#
      • 1...Rd5
        • 2.Rf1#
      • 1...Sc4
        • 2.Rg1#
      • 1...Re6!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Qxa2#
      • 1...Kb1
        • 2.Qxa2#
      • 1...Rxd5
        • 2.Rf1#
      • 1...Sc4
        • 2.Rg1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • R(f);N_GUARD,P_PINR(D),P_SPINS(c)::R(A)
    • S(c);N_GUARD,P_PINR(A),P_SPINR(f)::R(D)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • R(f);N_GUARD,P_PINR(D),P_SPINR(f),P_SPINS(c)::R(A),XR(f)
      • Refutation
        • S(c);CHECK,P_SPINR(f),P_SPINS(c)
    • Try
      • R(D);CHECK
      • Vars
        • S(c);N_GUARD,P_PINR(A),P_SPINR(f),P_SPINS(c)::R(D),XS(c)
      • Refutation
        • R(f);CHECK,P_SPINR(f),P_SPINS(c)
    • Try
      • Q(F);
      • Threat
        • QAR1(F),XR(b)
      • Vars
        • K(a);P-FLIGHT::QAB1(F),XR(b)
        • R(f);N_GUARD,P_PINR(D),P_SPINS(c)::R(A)
        • S(c);N_GUARD,P_PINR(A),P_SPINR(f)::R(D)
      • Refutation
        • R(f);P_PINR(D),P_SPINS(c)
  • Actual
    • Q(F);
    • Threat
      • QAR1(F),XR(b)
    • Vars
      • K(a);P-FLIGHT::QAB1(F),XR(b)
      • R(f);N_GUARD,P_PINR(D),P_SPINS(c),XQ(F)::R(A)
      • S(c);N_GUARD,P_PINR(A),P_SPINR(f)::R(D)
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