MESON Chess Problem Database

Problem Display
PID: 15309 (8/8/2Q5/8/3N4/1pn5/3p4/4k1K1 w - - 0 1)

Speckmann, Werner

Die Schwalbe, 1982

8/8/2Q5/8/3N4/1pn5/3p4/4k1K1

#2

3 + 4

3295 Einfuhrung in die Welt des Schachproblem 1984
133 The Problemist Supplement 2009
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...d1B
      • 2.Qxc3#
  • Tries
    • 1.Qf3?
      • threat
        • 2.Qf1#
      • 1...Se2+
        • 2.Qxe2#
      • 1...d1Q
        • 2.Qf2#
      • 1...d1B
        • 2.Qf2#
        • 2.Qxc3#
      • 1...d1R
        • 2.Qf2#
      • 1...d1S!
    • 1.Qxc3?
      • 1...Kd1
        • 2.Qa1#
      • 1...b2!
    • 1.Qc4?
      • threat
        • 2.Qf1#
      • 1...Se2+
        • 2.Qxe2#
      • 1...Kd1
        • 2.Qf1#
      • 1...d1S
        • 2.Sf3#
      • 1...d1B
        • 2.Qxc3#
      • 1...d1R
        • 2.Sf3#
      • 1...d1Q!
  • Keys
    • 1.Qg2!
      • threat
        • 2.Qf1#
      • 1...Se2+
        • 2.Qxe2#
      • 1...Kd1
        • 2.Qf1#
      • 1...d1Q
        • 2.Qf2#
      • 1...d1S
        • 2.Sf3#
      • 1...d1B
        • 2.Qf2#
      • 1...d1R
        • 2.Sf3#
        • 2.Qf2#

This anticipates 172242(1996)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(b);OGATEB,SBLOCK::QAB(C),XS(d)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • S(d);CHECK,N_GUARD::QAR1(C),XS(d)
        • P(b);SBLOCK::QAB1(C)
      • Refutation
        • P(b);
    • Try
      • Q(C);P_PINP(b),XS(d)
      • Vars
        • K(a);N_SPINP(b),P-FLIGHT::QAR(C)
      • Refutation
        • P(c);
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • S(d);CHECK,N_GUARD::QAR1(C),XS(d)
        • K(a);P-FLIGHT::QAR2(C)
        • P(b);SBLOCK::S(B)
        • P(b);OGATEB,SBLOCK::QAB(C),XS(d)
      • Refutation
        • P(b);
  • Actual
    • Q(C);
    • Threat
      • QAR1(C)
    • Vars
      • S(d);CHECK,N_GUARD::QAR1(C),XS(d)
      • K(a);P-FLIGHT::QAR2(C)
      • P(b);SBLOCK::QAB1(C)
      • P(b);SBLOCK::S(B)
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