MESON Chess Problem Database

Problem Display
PID: 70968 (2R5/nk6/R1p1Q3/8/K7/8/8/8 w - - 0 1)

Speckmann, Werner

Die Schwalbe, 1938

2R5/nk6/R1p1Q3/8/K7/8/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Sb5
      • 2.Qxc6#
    • 1...c5
      • 2.Rb6#
  • Tries
    • 1.Ka5?
      • threat
        • 2.Rb6#
        • 2.Qd7#
      • 1...Sb5
        • 2.Qxc6#
      • 1...Sxc8!
    • 1.Rd8?
      • 1...Kc7
        • 2.Qd7#
        • 2.Qe7#
      • 1...Sc8
        • 2.Qxc8#
      • 1...Sb5
        • 2.Qc8#
        • 2.Qxc6#
      • 1...c5
        • 2.Qb6#
      • 1...Kxa6!
    • 1.Re8?
      • 1...Kc7
        • 2.Qe7#
      • 1...Sc8
        • 2.Qxc8#
      • 1...Sb5
        • 2.Qc8#
        • 2.Qxc6#
      • 1...c5
        • 2.Qb6#
      • 1...Kxa6!
    • 1.Rf8?
      • 1...Kc7
        • 2.Qe7#
      • 1...Sc8
        • 2.Qxc8#
      • 1...Sb5
        • 2.Qc8#
        • 2.Qxc6#
      • 1...c5
        • 2.Qb6#
      • 1...Kxa6!
    • 1.Rg8?
      • 1...Kc7
        • 2.Qe7#
      • 1...Sc8
        • 2.Qxc8#
      • 1...Sb5
        • 2.Qc8#
        • 2.Qxc6#
      • 1...c5
        • 2.Qb6#
      • 1...Kxa6!
    • 1.Rh8?
      • 1...Kc7
        • 2.Qe7#
      • 1...Sc8
        • 2.Qxc8#
      • 1...Sb5
        • 2.Qc8#
        • 2.Qxc6#
      • 1...c5
        • 2.Qb6#
      • 1...Kxa6!
  • Keys
    • 1.Ra8!
      • 1...Kxa6
        • 2.Qxc6#
      • 1...Kc7
        • 2.Qe7#
      • 1...Kxa8
        • 2.Qc8#
      • 1...Sb5
        • 2.Qc8#
        • 2.Qxc6#
      • 1...Sc8
        • 2.Qd7#
        • 2.Qxc8#
        • 2.Qxc6#
      • 1...c5
        • 2.R6xa7#

This is after

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • S(b);N_GUARD::QAB1(C),XP(a)
    • P(a);::R1(B)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • S(b);N_GUARD::QAB1(C),XP(a)
      • Refutation
        • S(b);XR(D)
    • Try
      • R(D);
      • Vars
        • S(b);N_GUARD::QAB1(C),XS(b)
        • P(a);OGATE::QAR1(C)
      • Refutation
        • K(c);P_SPINP(a),S_FLIGHT,XR(B)
    • Try
      • R(D);
      • Vars
        • K(c);P-FLIGHT::QAR2(C)
        • S(b);N_GUARD::QAB1(C),XS(b)
        • P(a);OGATE::QAR1(C)
      • Refutation
        • K(c);P_SPINP(a),S_FLIGHT,XR(B)
    • Try
      • R(D);
      • Vars
        • K(c);P-FLIGHT::QAR2(C)
        • S(b);N_GUARD::QAB1(C),XS(b)
        • P(a);OGATE::QAR1(C)
      • Refutation
        • K(c);P_SPINP(a),S_FLIGHT,XR(B)
    • Try
      • R(D);
      • Vars
        • K(c);P-FLIGHT::QAR2(C)
        • S(b);N_GUARD::QAB1(C),XS(b)
        • P(a);OGATE::QAR1(C)
      • Refutation
        • K(c);P_SPINP(a),S_FLIGHT,XR(B)
    • Try
      • R(D);
      • Vars
        • K(c);P-FLIGHT::QAR2(C)
        • S(b);N_GUARD::QAB1(C),XS(b)
        • P(a);OGATE::QAR1(C)
      • Refutation
        • K(c);P_SPINP(a),S_FLIGHT,XR(B)
  • Actual
    • R(D);
    • Vars
      • K(c);P_SPINP(a),P_SPINS(b),S_FLIGHT,XR(B)::QAR2(C),XP(a)
      • K(c);P-FLIGHT::QAR2(C)
      • K(c);P_SPINS(b),S_FLIGHT,XR(D)::QAR2(C)
      • P(a);::R1(B),XS(b)
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