MESON Chess Problem Database

Problem Display
PID: 4515 (Q6b/8/8/4R3/4b3/K7/8/k6n w - - 0 1)

Lehner, Hermann Feodor

Deutsche Schachzeitung, 1873

Q6b/8/8/4R3/4b3/K7/8/k6n

#2

3 + 4

1114 Osterreichische Schachzeitung 1874
4331 Schachminiaturen II 1903
3295 Einfuhrung in die Welt des Schachproblem 1984
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bg2
      • 2.Re1#
    • 1...Bd5
      • 2.Re1#
    • 1...Bc6
      • 2.Re1#
    • 1...Bb7
      • 2.Re1#
    • 1...Bxa8
      • 2.Re1#
  • Tries
    • 1.Kb3+?
      • 1...Bxa8
        • 2.Re1#
      • 1...Kb1!
    • 1.Qxe4?
      • threat
        • 2.Qxh1#
        • 2.Qe1#
      • 1...Sg3
        • 2.Qe1#
      • 1...Sf2!
    • 1.Qb7?
      • threat
        • 2.Qb2#
      • 1...Bxb7
        • 2.Re1#
      • 1...Bxe5!
    • 1.Qb8?
      • threat
        • 2.Qb2#
      • 1...Bb7
        • 2.Re1#
      • 1...Bxe5!
    • 1.Qxh8?
      • threat
        • 2.Rb5#
      • 1...Bd5
        • 2.Re1#
      • 1...Kb1!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Qa2#
      • 1...Kb1
        • 2.Qd1#
      • 1...Bxd5
        • 2.Re1#
      • 1...Bb1
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • B(c);OGATE::R(B)
    • B(c);OGATE,XQ(C)::R(B)
  • Tries
    • Try
      • K(A);CHECK,P-FLIGHT
      • Vars
        • B(c);OGATE,XQ(C)::R(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);XB(c)
      • Threat
        • DUALS(2)
      • Vars
        • S(b);::QAR(C)
      • Refutation
        • S(b);
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • B(c);OGATE,XQ(C)::R(B)
      • Refutation
        • B(d);XR(B)
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • B(c);OGATE::R(B)
      • Refutation
        • B(d);XR(B)
    • Try
      • Q(C);XB(d)
      • Threat
        • QAB(C)+R(B)
      • Vars
        • B(c);OGATE::QAB(C)+R(B),DCHECK
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(C);
    • Threat
      • QAR1(C)
    • Vars
      • K(a);P-FLIGHT::QAR2(C)
      • B(c);OGATE,XQ(C)::R(B)
      • B(c);SBLOCK::QAB(C)
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