MESON Chess Problem Database

Problem Display
PID: 83731 (8/2K1p3/8/4Q1B1/BP2p1rb/2pk2qR/2R2P2/8 w - - 0 1)

Ellerman, Arnoldo

Die Schwalbe, 1968

8/2K1p3/8/4Q1B1/BP2p1rb/2pk2qR/2R2P2/8

#2

8 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qe3
      • 2.Qxc3#
      • 2.Qd5#
    • 1...Qf3
      • 2.Qxc3#
      • 2.Qd5#
    • 1...Qxh3
      • 2.Qxc3#
      • 2.Qd5#
    • 1...Rf4
      • 2.Qxc3#
      • 2.Qd5#
  • Tries
    • 1.Bf4?
      • threat
        • 2.Qxc3#
        • 2.Qd5#
      • 1...Kc4
        • 2.Qxe4#
      • 1...e3
        • 2.Qd5#
      • 1...Rg5
        • 2.Qxc3#
      • 1...e6
        • 2.Qxc3#
      • 1...Bf6!
    • 1.Rd2+?
      • 1...Kc4
        • 2.Rd4#
      • 1...cxd2!
  • Keys
    • 1.f4!
      • threat
        • 2.Qxc3#
      • 1...Ke3
        • 2.Qxc3#
      • 1...Kc4
        • 2.Qxe4#
      • 1...exf4 ep
        • 2.Rxc3#
      • 1...e3
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(G);N_SPINQ(F)
      • Threat
        • DUALS(2)
      • Vars
        • K(b);N_SPINQ(c),P_SPINP(a),S_FLIGHT::QAR2(F),XP(d)
        • P(d);N_SPINQ(c)::QAR2(F)
        • R(e);::QAR1(F),XP(a)
        • P(g);::QAR1(F),XP(a)
      • Refutation
        • B(f);
    • Try
      • R(A);CHECK
      • Vars
        • K(b);N_SPINQ(c),OGATE,S_FLIGHT::R1(A)
      • Refutation
        • P(a);XR(A)
  • Actual
    • P(B);N_SPINQ(F)
    • Threat
      • QAR1(F),XP(a)
    • Vars
      • K(b);P-FLIGHT,P_SPINP(d)::QAR2(F),XP(a)
      • K(b);N_SPINQ(c),P_SPINP(a),S_FLIGHT::QAR2(F),XP(d)
      • P(d);EP,N_SPINQ(c),P_PINQ(F),XP(B)::R1(A),XP(a)
      • P(d);N_SPINQ(c),SBLOCK::QAR2(F)
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