MESON Chess Problem Database

Problem Display
PID: 232389 (8/8/8/3Q4/8/8/n3k1N1/1N4K1 w - - 0 1)

Speckmann, Werner

Deutsche Schachzeitung, 1982

8/8/8/3Q4/8/8/n3k1N1/1N4K1

#2

4 + 2

15148 Sadier Collection 2021
5454 Near Snap 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Sc1
      • 2.Sc3#
    • 1...Sc3
      • 2.Sxc3#
    • 1...Sb4
      • 2.Sc3#
  • Tries
    • 1.Sf4+?
      • 1...Ke1
        • 2.Qd2#
      • 1...Ke3!
    • 1.Sh4?
      • threat
        • 2.Qd2#
      • 1...Ke1
        • 2.Qd2#
      • 1...Ke3!
  • Keys
    • 1.Se1!
      • threat
        • 2.Qd2#
      • 1...Kxe1
        • 2.Qd2#
      • 1...Ke3
        • 2.Qe5#

Anticipated by 15306(1982)

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • S(a);N_GUARD::S(A)
    • S(a);N_GUARD::S(A),XS(a)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB1(D)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • S(C);
      • Threat
        • QAR1(D)
      • Vars
        • K(b);P-FLIGHT::QAB1(D)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • S(C);
    • Threat
      • QAR1(D)
    • Vars
      • K(b);P-FLIGHT,XS(C)::QAB1(D)
      • K(b);P-FLIGHT::QAR2(D)
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