MESON Chess Problem Database

Problem Display
PID: 238658 (4B3/8/3Q4/r4p2/2kN4/p7/2K5/8 w - - 0 1)

Mink, Christoph

Die Schwalbe, 1970

4B3/8/3Q4/r4p2/2kN4/p7/2K5/8

#2

4 + 4

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ra4
      • 2.Bb5#
      • 2.Bf7#
    • 1...Rb5
      • 2.Bxb5#
    • 1...Ra6
      • 2.Bb5#
      • 2.Bf7#
    • 1...Ra7
      • 2.Bb5#
    • 1...Ra8
      • 2.Bb5#
      • 2.Bf7#
  • Tries
    • 1.Sb3?
      • threat
        • 2.Sd2#
        • 2.Sxa5#
        • 2.Qd4#
      • 1...Rc5
        • 2.Qxc5#
        • 2.Qd4#
      • 1...Ra4
        • 2.Sd2#
        • 2.Qc5#
        • 2.Qd4#
      • 1...Rb5
        • 2.Sd2#
        • 2.Qd4#
      • 1...Re5
        • 2.Sd2#
        • 2.Qd4#
      • 1...Ra6
        • 2.Sd2#
        • 2.Qc5#
        • 2.Qd4#
      • 1...Ra7
        • 2.Sd2#
        • 2.Qc5#
        • 2.Qd4#
      • 1...Ra8
        • 2.Sd2#
        • 2.Qc5#
        • 2.Qd4#
      • 1...Rd5!
    • 1.Sf3?
      • threat
        • 2.Sd2#
        • 2.Qd4#
      • 1...Rc5
        • 2.Qd4#
      • 1...Rd5!
  • Keys
    • 1.Sc6!
      • threat
        • 2.Sxa5#
      • 1...Kb5
        • 2.Se5#
      • 1...Rd5
        • 2.Qb4#
      • 1...Ra4
        • 2.Se5#
      • 1...Rb5
        • 2.Qd4#
      • 1...Rc5
        • 2.Qd3#
      • 1...Re5
        • 2.Sxe5#
      • 1...Ra6
        • 2.Se5#
      • 1...Ra7
        • 2.Se5#
      • 1...Ra8
        • 2.Se5#

Anticipated by 4695(1887), 120949(1901), 52598(1960)

This anticipates 102478(1975), 187410(2014)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • R(c);N_GUARD::B(D),XR(c)
    • R(c);N_GUARD::B(D)
  • Tries
    • Try
      • S(B);
      • Threat
        • DUALS(3)
      • Refutation
        • R(c);
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);::QAR1(C)
      • Refutation
        • R(c);
  • Actual
    • S(B);
    • Threat
      • S(B),XR(c)
    • Vars
      • K(b);S_FLIGHT::B(D)+S(B)
      • R(c);SBLOCK::QAR1(C)
      • R(c);N_GUARD::S(B)
      • R(c);SBLOCK::QAB1(C)
      • R(c);N_GUARD::S(B),XR(c)
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