MESON Chess Problem Database

Problem Display
PID: 95255 (k7/2n4R/8/1R1p4/K7/8/6Q1/8 w - - 0 1)

Ferber, Eugene

Deutsches Wochenschach, 1910

k7/2n4R/8/1R1p4/K7/8/6Q1/8

#2

4 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sxb5
      • 2.Qg8#
    • 1...Sa6
      • 2.Qxd5#
    • 1...Se6
      • 2.Qxd5#
    • 1...Se8
      • 2.Qxd5#
  • Tries
    • 1.Kb4?
      • 1...Ka7
        • 2.Qa2#
      • 1...Sxb5
        • 2.Qg8#
      • 1...Se6
        • 2.Qxd5#
        • 2.Qa2#
      • 1...Se8
        • 2.Qxd5#
        • 2.Qa2#
      • 1...Sa6+!
    • 1.Ka5?
      • 1...Sxb5
        • 2.Qg8#
      • 1...Sa6
        • 2.Qxd5#
      • 1...Se6
        • 2.Qxd5#
      • 1...Se8
        • 2.Qxd5#
      • 1...Ka7!
    • 1.Rb1?
      • 1...Sb5
        • 2.Qg8#
      • 1...Sa6
        • 2.Qxd5#
      • 1...Se6
        • 2.Qxd5#
      • 1...Se8
        • 2.Qxd5#
      • 1...Ka7!
    • 1.Rb2?
      • 1...Sb5
        • 2.Qg8#
      • 1...Sa6
        • 2.Qxd5#
      • 1...Se6
        • 2.Qxd5#
      • 1...Se8
        • 2.Qxd5#
      • 1...Ka7!
    • 1.Rb3?
      • 1...Sb5
        • 2.Qg8#
      • 1...Sa6
        • 2.Qxd5#
      • 1...Se6
        • 2.Qxd5#
      • 1...Se8
        • 2.Qxd5#
      • 1...Ka7!
    • 1.Rb4?
      • 1...Sb5
        • 2.Qg8#
      • 1...Sa6
        • 2.Qxd5#
      • 1...Se6
        • 2.Qxd5#
      • 1...Se8
        • 2.Qxd5#
      • 1...Ka7!
    • 1.Rb6?
      • 1...Sb5
        • 2.Qxd5#
        • 2.Qg8#
      • 1...Sa6
        • 2.Qxd5#
      • 1...Se6
        • 2.Qxd5#
      • 1...Se8
        • 2.Qxd5#
      • 1...Ka7!
    • 1.Rd7?
      • 1...Sxb5
        • 2.Qg8#
      • 1...Sa6
        • 2.Qxd5#
      • 1...Se6
        • 2.Qxd5#
      • 1...Se8
        • 2.Qxd5#
      • 1...Ka7!
    • 1.Re7?
      • 1...Sxb5
        • 2.Qg8#
      • 1...Sa6
        • 2.Qxd5#
      • 1...Se6
        • 2.Qxd5#
      • 1...Se8
        • 2.Qxd5#
      • 1...Ka7!
    • 1.Rf7?
      • 1...Sxb5
        • 2.Qg8#
      • 1...Sa6
        • 2.Qxd5#
      • 1...Se6
        • 2.Qxd5#
      • 1...Se8
        • 2.Qxd5#
      • 1...Ka7!
    • 1.Qf3?
      • 1...Sxb5
        • 2.Qf8#
      • 1...Sa6
        • 2.Qxd5#
      • 1...Se6
        • 2.Qxd5#
      • 1...Se8
        • 2.Qxd5#
      • 1...Ka7!
    • 1.Qxd5+?
      • 1...Ka7
        • 2.Qb7#
      • 1...Sxd5!
    • 1.Qg1?
      • 1...Sxb5
        • 2.Qg8#
      • 1...Sa6
        • 2.Ra7#
        • 2.Qa7#
      • 1...Se6
        • 2.Ra7#
        • 2.Qa7#
      • 1...Se8
        • 2.Ra7#
        • 2.Qa7#
      • 1...d4!
    • 1.Qf2?
      • 1...Sxb5
        • 2.Qf8#
      • 1...Sa6
        • 2.Ra7#
        • 2.Qa7#
      • 1...Se6
        • 2.Ra7#
        • 2.Qa7#
      • 1...Se8
        • 2.Ra7#
        • 2.Qa7#
      • 1...d4!
    • 1.Qg8+?
      • 1...Se8
        • 2.Qxd5#
        • 2.Qxe8#
      • 1...Ka7!
  • Keys
    • 1.Kb3!
      • 1...Ka7
        • 2.Qa2#
      • 1...Sxb5
        • 2.Qg8#
      • 1...Sa6
        • 2.Qxd5#
      • 1...Se6
        • 2.Qxd5#
        • 2.Qa2#
      • 1...Se8
        • 2.Qxd5#
        • 2.Qa2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • S(b);N_GUARD,XR(C)::QAR(A)
    • S(b);N_GUARD::QAB(A),XP(a)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • K(c);N_SPINP(a),P-FLIGHT,P_SPINS(b)::QAR(A)
        • S(b);N_GUARD,XR(C)::QAR(A)
      • Refutation
        • S(b);CHECK
    • Try
      • K(B);P-FLIGHT
      • Vars
        • S(b);N_GUARD,XR(C)::QAR(A)
        • S(b);N_GUARD::QAB(A),XP(a)
      • Refutation
        • K(c);N_SPINP(a),P-FLIGHT,P_SPINS(b)
    • Try
      • R(C);
      • Vars
        • S(b);N_GUARD::QAR(A)
        • S(b);N_GUARD::QAB(A),XP(a)
      • Refutation
        • K(c);N_SPINP(a),P-FLIGHT,P_SPINS(b)
    • Try
      • R(C);
      • Vars
        • S(b);N_GUARD::QAR(A)
        • S(b);N_GUARD::QAB(A),XP(a)
      • Refutation
        • K(c);N_SPINP(a),P-FLIGHT,P_SPINS(b)
    • Try
      • R(C);
      • Vars
        • S(b);N_GUARD::QAR(A)
        • S(b);N_GUARD::QAB(A),XP(a)
      • Refutation
        • K(c);N_SPINP(a),P-FLIGHT,P_SPINS(b)
    • Try
      • R(C);
      • Vars
        • S(b);N_GUARD::QAR(A)
        • S(b);N_GUARD::QAB(A),XP(a)
      • Refutation
        • K(c);N_SPINP(a),P-FLIGHT,P_SPINS(b)
    • Try
      • R(C);
      • Vars
        • S(b);N_GUARD::QAB(A),XP(a)
      • Refutation
        • K(c);N_SPINP(a),P-FLIGHT,P_SPINS(b)
    • Try
      • R(D);
      • Vars
        • S(b);N_GUARD,XR(C)::QAR(A)
        • S(b);N_GUARD::QAB(A),XP(a)
      • Refutation
        • K(c);N_SPINP(a),P-FLIGHT,P_SPINS(b)
    • Try
      • R(D);
      • Vars
        • S(b);N_GUARD,XR(C)::QAR(A)
        • S(b);N_GUARD::QAB(A),XP(a)
      • Refutation
        • K(c);N_SPINP(a),P-FLIGHT,P_SPINS(b)
    • Try
      • R(D);
      • Vars
        • S(b);N_GUARD,XR(C)::QAR(A)
        • S(b);N_GUARD::QAB(A),XP(a)
      • Refutation
        • K(c);N_SPINP(a),P-FLIGHT,P_SPINS(b)
    • Try
      • Q(A);
      • Vars
        • S(b);N_GUARD,XR(C)::QAR(A)
        • S(b);N_GUARD::QAB(A),XP(a)
      • Refutation
        • K(c);N_SPINP(a),P-FLIGHT,P_SPINS(b)
    • Try
      • Q(A);CHECK,XP(a)
      • Vars
        • K(c);P-FLIGHT,P_SPINS(b)::QAR1(A)
      • Refutation
        • S(b);XQ(A)
    • Try
      • Q(A);N_PINP(a)
      • Vars
        • S(b);N_GUARD,XR(C)::QAR(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);N_PINP(a)
      • Vars
        • S(b);N_GUARD,XR(C)::QAR(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);CHECK,N_PINP(a)
      • Refutation
        • K(c);P-FLIGHT,P_SPINS(b)
  • Actual
    • K(B);S_FLIGHT
    • Vars
      • K(c);N_SPINP(a),P-FLIGHT,P_SPINS(b)::QAR(A)
      • S(b);N_GUARD,XR(C)::QAR(A)
      • S(b);N_GUARD::QAB(A),XP(a)
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