MESON Chess Problem Database

Problem Display
PID: 213825 (5Q2/8/4p3/3Nk3/4pR1K/2p5/2P5/8 w - - 0 1)

Hane, Johannes

Funkschach, 1926

5Q2/8/4p3/3Nk3/4pR1K/2p5/2P5/8

#2

5 + 4

15148 Sadier Collection 2020
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...exd5
      • 2.Qf6#
  • Tries
    • 1.Sxc3?
      • threat
        • 2.Rxe4#
      • 1...e3
        • 2.Re4#
        • 2.Qb8#
      • 1...Kd4!
    • 1.Sb4?
      • 1...e3
        • 2.Qb8#
      • 1...Kd4!
    • 1.Sb6?
      • 1...e3
        • 2.Qb8#
      • 1...Kd4!
    • 1.Rf5+?
      • 1...Kd4
        • 2.Qb4#
      • 1...exf5!
  • Keys
    • 1.Sf6!
      • 1...Kd4
        • 2.Rxe4#
      • 1...Kxf4
        • 2.Sg4#
      • 1...e3
        • 2.Qb8#

Anticipated by 121315(1883), 193733(1916)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • P(d);SBLOCK,XS(D)::QAB1(E)
  • Tries
    • Try
      • S(D);XP(a)
      • Threat
        • R1(B),XP(b)
      • Refutation
        • K(c);P_SPINP(b),S_FLIGHT
    • Try
      • S(D);
      • Vars
        • P(b);::QAB(E)
      • Refutation
        • K(c);P_SPINP(b),S_FLIGHT
    • Try
      • S(D);
      • Vars
        • P(b);::QAB(E)
      • Refutation
        • K(c);P_SPINP(b),S_FLIGHT
    • Try
      • R(B);CHECK
      • Vars
        • K(c);S_FLIGHT::QAR2(E)
      • Refutation
        • P(d);XR(B)
  • Actual
    • S(D);
    • Vars
      • K(c);P_SPINP(b),S_FLIGHT::R1(B),XP(b)
      • K(c);S_FLIGHT,XR(B)::QAR(E)+S(D)
      • P(b);::QAB(E)
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