MESON Chess Problem Database

Problem Display
PID: 121315 (3Q4/8/4p3/4kN2/1K1Rp3/6p1/6P1/8 w - - 0 1)

Gold, S?

200 Schachaufgaben, 1883

3Q4/8/4p3/4kN2/1K1Rp3/6p1/6P1/8

#2

5 + 4

6490 yacpdb 2009
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...exf5
      • 2.Qd6#
  • Tries
    • 1.Sxg3?
      • threat
        • 2.Rxe4#
      • 1...e3
        • 2.Re4#
        • 2.Qh8#
      • 1...Kf4!
    • 1.Sh4?
      • 1...e3
        • 2.Qh8#
      • 1...Kf4!
    • 1.Sh6?
      • 1...e3
        • 2.Qh8#
      • 1...Kf4!
    • 1.Rd5+?
      • 1...Kf4
        • 2.Qh4#
      • 1...exd5!
  • Keys
    • 1.Sd6!
      • 1...Kxd4
        • 2.Sc4#
      • 1...Kf4
        • 2.Rxe4#
      • 1...e3
        • 2.Qh8#

This anticipates 193733(1916), 213825(1926)

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(C),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(C);CHECK
      • Vars
        • K(c);S_FLIGHT::QAR2(E)
      • Refutation
        • P(d);XR(C)
  • Actual
    • S(D);
    • Vars
      • K(c);S_FLIGHT,XR(C)::QAR(E)+S(D)
      • K(c);P_SPINP(b),S_FLIGHT::R1(C),XP(b)
      • P(b);::QAB(E)
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