MESON Chess Problem Database

Problem Display
PID: 244907 (8/8/8/8/8/2N4n/R6p/2Q1K2k w - - 0 1)

Seidemann, Felix

Die Schwalbe, 1929

8/8/8/8/8/2N4n/R6p/2Q1K2k

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Sf2
      • 2.Kxf2#
    • 1...Sf4
      • 2.Kf2#
    • 1...Sg5
      • 2.Kf2#
  • Tries
    • 1.Kf1?
      • 1...Sf2
        • 2.Kxf2#
      • 1...Sf4
        • 2.Kf2#
      • 1...Sg5
        • 2.Kf2#
      • 1...Sg1!
    • 1.Se4?
      • 1...Sf2
        • 2.Kxf2#
      • 1...Sg1
        • 2.Sg3#
      • 1...Sf4
        • 2.Kf2#
      • 1...Sg5
        • 2.Kf2#
      • 1...Kg1!
    • 1.Re2?
      • 1...Kg1
        • 2.Kd2#
      • 1...Sf2
        • 2.Kxf2#
      • 1...Sf4
        • 2.Kd2#
        • 2.Kf2#
      • 1...Sg5
        • 2.Kd2#
        • 2.Kf2#
      • 1...Sg1!
    • 1.Rf2?
      • 1...Kg1
        • 2.Ke2#
      • 1...Sxf2
        • 2.Kxf2#
      • 1...Sf4
        • 2.Kd2#
      • 1...Sg5
        • 2.Kd2#
        • 2.Ke2#
      • 1...Sg1!
    • 1.Qb2?
      • threat
        • 2.Qg2#
        • 2.Qxh2#
      • 1...Kg1
        • 2.Qg2#
        • 2.Qxh2#
      • 1...Sf4
        • 2.Qxh2#
      • 1...Sf2!
    • 1.Qd2?
      • threat
        • 2.Qg2#
        • 2.Qxh2#
      • 1...Kg1
        • 2.Qg2#
        • 2.Qxh2#
      • 1...Sf4
        • 2.Qxh2#
      • 1...Sf2!
    • 1.Qc2?
      • threat
        • 2.Qg2#
        • 2.Qxh2#
      • 1...Kg1
        • 2.Qg2#
        • 2.Qxh2#
      • 1...Sf4
        • 2.Qxh2#
      • 1...Sf2!
  • Keys
    • 1.Se2!
      • threat
        • 2.Qc6#
      • 1...Kg2
        • 2.Qc6#
      • 1...Sg1
        • 2.Sg3#
      • 1...Sf2
        • 2.Kxf2#
      • 1...Sf4
        • 2.Kf2#
      • 1...Sg5
        • 2.Kf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(c);::QAR(A)+K(B),XS(c)
    • S(c);::QAR(A)+K(B)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • S(c);::QAR(A)+K(B),XS(c)
        • S(c);::QAR(A)+K(B)
      • Refutation
        • S(c);
    • Try
      • S(D);
      • Vars
        • S(c);::QAR(A)+K(B),XS(c)
        • S(c);SBLOCK::S(D)
        • S(c);::QAR(A)+K(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(C);
      • Vars
        • K(a);P-FLIGHT::QAR(A)+K(B)
        • S(c);::QAR(A)+K(B),XS(c)
      • Refutation
        • S(c);
    • Try
      • R(C);
      • Vars
        • K(a);P-FLIGHT::QAR(A)+K(B)
        • S(c);XR(C)::QAR(A)+K(B),XS(c)
        • S(c);N_GUARD::QAR(A)+K(B)
      • Refutation
        • S(c);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);::QAR1(A),XP(b)
      • Refutation
        • S(c);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);::QAR1(A),XP(b)
      • Refutation
        • S(c);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);::QAR1(A),XP(b)
      • Refutation
        • S(c);
  • Actual
    • S(D);
    • Threat
      • QAB(A)
    • Vars
      • K(a);S_FLIGHT::QAB(A)
      • S(c);SBLOCK::S(D)
      • S(c);::QAR(A)+K(B),XS(c)
      • S(c);::QAR(A)+K(B)
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