MESON Chess Problem Database

Problem Display
PID: 244910 (1QR2b2/K7/1p6/8/3k4/3pNP1n/3n1P2/8 w - - 0 1)

Willemson, Martin

Die Schwalbe, 1929

1QR2b2/K7/1p6/8/3k4/3pNP1n/3n1P2/8

#2

6 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Bd6
      • 2.Qxd6#
    • 1...Bh6
      • 2.Qd6#
    • 1...Bg7
      • 2.Qd6#
    • 1...Sb1
      • 2.Rc4#
    • 1...Sf1
      • 2.Rc4#
    • 1...Sb3
      • 2.Rc4#
    • 1...Sxf3
      • 2.Rc4#
    • 1...Sc4
      • 2.Rxc4#
    • 1...Se4
      • 2.Rc4#
  • Tries
    • 1.Qf4+?
      • 1...Se4
        • 2.Rc4#
        • 2.Qxe4#
      • 1...Sxf4!
    • 1.Qxb6+?
      • 1...Bc5
        • 2.Qxc5#
      • 1...Ke5!
  • Keys
    • 1.Rc5!
      • threat
        • 2.Qe5#
      • 1...Kxc5
        • 2.Qxb6#
      • 1...Bxc5
        • 2.Qh8#
      • 1...Sxf3
        • 2.Rc4#
      • 1...bxc5
        • 2.Qb2#
      • 1...Sc4
        • 2.Rxc4#
      • 1...Bd6
        • 2.Qxd6#
      • 1...Bg7
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • B(f);N_GUARD::QAR2(E),XB(f)
    • B(f);N_GUARD::QAR2(E)
    • S(a);N_GUARD::R1(F)
    • S(a);N_GUARD,XP(C)::R1(F)
    • S(a);N_GUARD::R1(F),XS(a)
  • Tries
    • Try
      • Q(E);CHECK
      • Refutation
        • S(c);XQ(E)
    • Try
      • Q(E);CHECK,XP(e)
      • Vars
        • B(f);N_GUARD,P_PINQ(E),P_SPINB(f)::QAB1(E),XB(f)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • R(F);
    • Threat
      • QAB1(E)
    • Vars
      • K(d);OGATEB,S_FLIGHT,XR(F)::QAB1(E),XP(e)
      • B(f);OGATE,SBLOCK,XR(F)::QAB(E)
      • S(a);N_GUARD,XP(C)::R1(F)
      • P(e);OGATE,SBLOCK,XR(F)::QAB(E)
      • S(a);N_GUARD::R1(F),XS(a)
      • B(f);N_GUARD::QAR2(E),XB(f)
      • B(f);N_GUARD::QAR2(E)
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