MESON Chess Problem Database

Problem Display
PID: 15209 (8/8/8/8/8/3Q4/3pN1n1/1r2k1K1 w - - 0 1)

Speckmann, Werner

Deutsche Schachzeitung, 1981

8/8/8/8/8/3Q4/3pN1n1/1r2k1K1

#2

3 + 4

3295 Einfuhrung in die Welt des Schachproblem 1984
5454 Near Snap 2007

SOLUTION

  • SOUND
  • Tries
    • 1.Sg3?
      • threat
        • 2.Qf1#
        • 2.Qe2#
      • 1...Kd1
        • 2.Qxb1#
      • 1...d1S
        • 2.Qe2#
      • 1...d1B
        • 2.Qc3#
      • 1...d1R
        • 2.Qe2#
      • 1...Se3
        • 2.Qe2#
      • 1...Sf4
        • 2.Qf1#
      • 1...d1Q!
    • 1.Sd4?
      • threat
        • 2.Qf1#
        • 2.Qe2#
      • 1...Kd1
        • 2.Qxb1#
      • 1...d1S
        • 2.Sc2#
        • 2.Sf3#
        • 2.Qe2#
      • 1...d1B
        • 2.Qc3#
      • 1...d1R
        • 2.Sc2#
        • 2.Sf3#
        • 2.Qe2#
      • 1...Se3
        • 2.Qe2#
      • 1...Sf4
        • 2.Qf1#
      • 1...d1Q!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Qf1#
        • 2.Qe2#
      • 1...Kd1
        • 2.Qxb1#
      • 1...Sxf4
        • 2.Qf1#
      • 1...d1Q
        • 2.Sxg2#
      • 1...d1S
        • 2.Sxg2#
        • 2.Qe2#
      • 1...d1B
        • 2.Sxg2#
        • 2.Qc3#
      • 1...d1R
        • 2.Sxg2#
        • 2.Qe2#
      • 1...Se3
        • 2.Qe2#

Anticipated by 29053(1955)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT,P_SPINP(c)::QAR2(C),XR(a)
        • P(c);::QAR1(C)
        • P(c);OGATEB,SBLOCK::QAB(C)
        • S(d);::QAR1(C)
      • Refutation
        • P(c);
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT,P_SPINP(c)::QAR2(C),XR(a)
        • P(c);OGATEB,SBLOCK::QAB(C)
        • S(d);::QAR1(C)
      • Refutation
        • P(c);
  • Actual
    • S(B);
    • Threat
      • DUALS(2)
    • Vars
      • K(b);P-FLIGHT,P_SPINP(c)::QAR2(C),XR(a)
      • S(d);XS(B)::QAR1(C)
      • P(c);::S(B),XS(d)
      • S(d);::QAR1(C)
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