MESON Chess Problem Database

Problem Display
PID: 142145 (8/b7/6p1/1K1N4/4k1P1/2Q5/3R4/8 w - - 0 1)

Reiners, Joachim

Die Schwalbe, 1974

8/b7/6p1/1K1N4/4k1P1/2Q5/3R4/8

#2

5 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Be3
      • 2.Qxe3#
    • 1...Bb8
      • 2.Qe3#
  • Tries
    • 1.Re2+?
      • 1...Kxd5
        • 2.Qe5#
      • 1...Be3!
    • 1.Qb4+?
      • 1...Kf3
        • 2.Qf4#
      • 1...Ke5
        • 2.Qe7#
      • 1...Bd4!
    • 1.Qd4+?
      • 1...Kf3
        • 2.Qf4#
      • 1...Bxd4!
    • 1.Qe5+?
      • 1...Kf3
        • 2.Qf4#
      • 1...Kxe5!
    • 1.Qg3?
      • threat
        • 2.Sc3#
        • 2.Sf6#
        • 2.Qf4#
      • 1...Be3
        • 2.Sc3#
        • 2.Sf6#
        • 2.Qxe3#
      • 1...Bb8
        • 2.Sc3#
        • 2.Sf6#
        • 2.Qe3#
      • 1...g5
        • 2.Sc3#
        • 2.Sf6#
      • 1...Bd4!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Qf4#
      • 1...Bd4
        • 2.Rxd4#
      • 1...Be3
        • 2.Sc3#
      • 1...Bb8
        • 2.Rd4#
      • 1...g5
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(c);N_GUARD::QAR1(B),XB(c)
    • B(c);N_GUARD::QAR1(B)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • K(a);S_FLIGHT,XS(E)::QAR1(B)
      • Refutation
        • B(c);P_SPINB(c)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(B)
        • K(a);P-FLIGHT::QAR2(B)
      • Refutation
        • B(c);P_SPINB(c)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(B)
      • Refutation
        • B(c);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT,XQ(B)
    • Try
      • Q(B);
      • Threat
        • DUALS(3)
      • Refutation
        • B(c);
  • Actual
    • Q(B);
    • Threat
      • QAR1(B)
    • Vars
      • B(c);N_GUARD::R1(A),XB(c)
      • B(c);SBLOCK::S(E)
      • B(c);N_GUARD::R1(A)
      • P(b);N_GUARD::QAB1(B)
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