MESON Chess Problem Database

Problem Display
PID: 271387 (4R2r/4B3/2N3Np/1Q1p4/6B1/p2pk3/8/6bK w - - 0 1)

Ellerman, Arnoldo

Die Schwalbe, 1932

4R2r/4B3/2N3Np/1Q1p4/6B1/p2pk3/8/6bK

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Bf8#
    • 1...Bf2
      • 2.Bg5#
    • 1...d2
      • 2.Bc5#
      • 2.Qe2#
  • Tries
    • 1.Qxd3+?
      • 1...Kf2
        • 2.Bh4#
      • 1...Kxd3!
    • 1.Qb4?
      • threat
        • 2.Bc5#
        • 2.Qe1#
        • 2.Qf4#
      • 1...Rxe8
        • 2.Qe1#
        • 2.Qf4#
      • 1...d2
        • 2.Qd4#
      • 1...d4
        • 2.Qe1#
      • 1...Rf8
        • 2.Bc5#
        • 2.Qe1#
      • 1...Bf2
        • 2.Bc5#
        • 2.Bg5#
        • 2.Bf8#
        • 2.Qf4#
      • 1...Bh2
        • 2.Bc5#
        • 2.Qe1#
      • 1...Kf2!
  • Keys
    • 1.Qb1!
      • threat
        • 2.Qe1#
      • 1...Kd2
        • 2.Bb4#
      • 1...Kf2
        • 2.Bh4#
        • 2.Qxg1#
      • 1...Ke4
        • 2.Bf8#
      • 1...Bf2
        • 2.Bg5#
      • 1...d2
        • 2.Bc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(d);N_GUARD,P-FLIGHT::R(G)+B(F)
    • B(a);SBLOCK::R(G)+B(F),DCHECK
  • Tries
    • Try
      • Q(C);CHECK,XP(c)
      • Vars
        • K(d);N_GUARD,S_FLIGHT::B(F)
      • Refutation
        • K(d);P-FLIGHT,XQ(C)
    • Try
      • Q(C);
      • Threat
        • DUALS(3)
      • Vars
        • P(c);::QAB1(C)
        • P(e);::QAR2(C)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • Q(C);
    • Threat
      • QAR2(C)
    • Vars
      • K(d);N_GUARD,S_CUTR(g),S_FLIGHT::B(F)
      • K(d);N_GUARD,P-FLIGHT,P_SPINP(c)::R(G)+B(F)
      • B(a);SBLOCK::R(G)+B(F),DCHECK
      • P(c);SBLOCK::R(G)+B(F),DCHECK
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