MESON Chess Problem Database

Problem Display
PID: 149909 (4r3/6QB/N1pnp2p/N2pPp2/Pp1k4/6B1/1P2K3/8 w - - 0 1)

Busack, Otto

Die Schwalbe, 1939

4r3/6QB/N1pnp2p/N2pPp2/Pp1k4/6B1/1P2K3/8

#2

9 + 9

15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Qg4#
    • 1...f4
      • 2.Bf2#
  • Tries
    • 1.Sb3+?
      • 1...Ke4
        • 2.Sac5#
        • 2.Qg4#
      • 1...Kc4!
    • 1.Sxc6+?
      • 1...Ke4
        • 2.Sc5#
        • 2.Qg4#
      • 1...Kc4!
    • 1.Qxh6?
      • threat
        • 2.Qe3#
      • 1...Ke4
        • 2.Qe3#
        • 2.Qf4#
        • 2.Qh4#
      • 1...Sc4
        • 2.Qf4#
      • 1...f4!
    • 1.Qg5?
      • threat
        • 2.Qe3#
      • 1...Ke4
        • 2.Qe3#
        • 2.Qf4#
        • 2.Qh4#
        • 2.Qg4#
      • 1...Sc4
        • 2.Qf4#
      • 1...f4
        • 2.Bf2#
      • 1...hxg5!
    • 1.Qa7+?
      • 1...Ke4
        • 2.Qe3#
      • 1...c5!
    • 1.exd6+?
      • 1...Ke4
        • 2.Sc5#
        • 2.Qe5#
        • 2.Qg4#
      • 1...e5!
  • Keys
    • 1.Sc5!
      • threat
        • 2.Bf2#
      • 1...Kxc5
        • 2.Qa7#
      • 1...Sc4
        • 2.Sab3#
      • 1...Se4
        • 2.Scb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • K(b);P-FLIGHT,P_SPINP(d)::QAR2(H)
    • P(d);::B(C)
  • Tries
    • Try
      • S(E);CHECK
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • S(E);CHECK,XP(e)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(H);XP(h)
      • Threat
        • QAB1(H)
      • Vars
        • S(f);N_GUARD::QAR2(H)
      • Refutation
        • P(d);
    • Try
      • Q(H);
      • Threat
        • QAB1(H)
      • Vars
        • S(f);N_GUARD::QAR2(H)
        • P(d);::B(C)
      • Refutation
        • P(h);XQ(H)
    • Try
      • Q(H);CHECK
      • Vars
        • K(b);OGATE,P-FLIGHT,P_SPINP(d)::QAR1(H)
      • Refutation
        • P(e);P_SPINP(e)
    • Try
      • P(F);CHECK,XS(f)
      • Refutation
        • P(g);P_SPINP(g)
  • Actual
    • S(G);
    • Threat
      • B(C)
    • Vars
      • K(b);OGATEB,S_FLIGHT,XS(G)::QAB(H)
      • S(f);SBLOCK::S(E)
      • S(f);SBLOCK::S(G)
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