MESON Chess Problem Database

Problem Display
PID: 135634 (3Q3b/8/8/8/4kpR1/5R2/8/3K4 w - - 0 1)

Lincoln, Robert A

Melnichuk-50 JT, 2007

3Q3b/8/8/8/4kpR1/5R2/8/3K4

#2

4 + 3

145 StrateGems 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Be5
      • 2.Qd3#
  • Tries
    • 1.Re3+?
      • 1...Kf5
        • 2.Rg5#
        • 2.Qg5#
      • 1...Kxe3!
    • 1.Rfxf4+?
      • 1...Ke3
        • 2.Qd2#
      • 1...Ke5!
    • 1.Rg5?
      • threat
        • 2.Qd3#
        • 2.Qd5#
      • 1...Bd4
        • 2.Qd5#
        • 2.Qa8#
      • 1...Be5
        • 2.Qd3#
      • 1...Kxf3!
    • 1.Qg5?
      • threat
        • 2.Rgxf4#
      • 1...Kxf3
        • 2.Qxf4#
      • 1...Kd4
        • 2.Rgxf4#
      • 1...Be5!
  • Keys
    • 1.Qd6!
      • threat
        • 2.Rgxf4#
      • 1...Kxf3
        • 2.Qxf4#
      • 1...Kf5
        • 2.Rfxf4#
      • 1...Be5
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(c);SBLOCK::QAB1(D)
  • Tries
    • Try
      • R(B);CHECK
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT,XR(B)
    • Try
      • R(B);CHECK,XP(b)
      • Vars
        • K(a);P-FLIGHT::QAB1(D)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(C);N_PINP(b)
      • Threat
        • DUALS(2)
      • Vars
        • B(c);::QAB1(D)
      • Refutation
        • K(a);S_FLIGHT,XR(B)
    • Try
      • Q(D);
      • Threat
        • R1(C),XP(b)
      • Vars
        • K(a);N_SPINP(b),S_FLIGHT,XR(B)::QAR1(D),XP(b)
        • K(a);P-FLIGHT::R(C),XP(b)
      • Refutation
        • B(c);
  • Actual
    • Q(D);
    • Threat
      • R1(C),XP(b)
    • Vars
      • K(a);N_SPINP(b),S_FLIGHT,XR(B)::QAR1(D),XP(b)
      • K(a);S_FLIGHT::R1(B),XP(b)
      • B(c);SBLOCK::QAB1(D)
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