MESON Chess Problem Database

Problem Display
PID: 266867 (r2R3q/3N4/6p1/4Rp2/3k4/5P1p/p7/K1Q5 w - - 0 1)

Willmott, Arthur

The Problemist, 1998

r2R3q/3N4/6p1/4Rp2/3k4/5P1p/p7/K1Q5

#2

6 + 7

5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kd3
      • 2.Sc5#
  • Tries
    • 1.Sb6+?
      • 1...Qxd8
        • 2.Qe3#
      • 1...Rxd8
        • 2.Qe3#
      • 1...Kxe5!
    • 1.Re4+?
      • 1...Kd3+
        • 2.Se5#
      • 1...Kd5+
        • 2.Sf6#
      • 1...fxe4!
    • 1.Rc5?
      • threat
        • 2.Qd2#
        • 2.Qc3#
      • 1...Qh6
        • 2.Sb8#
        • 2.Qc3#
      • 1...Ra3
        • 2.Sf8#
      • 1...Kd3+!
    • 1.Qb2+?
      • 1...Kc4
        • 2.Sb6#
      • 1...Kd3!
  • Keys
    • 1.Re1!
      • threat
        • 2.Rd1#
      • 1...Kd3+
        • 2.Se5#
      • 1...Kd5+
        • 2.Sf6#
      • 1...Qh6
        • 2.Sb8#
      • 1...Ra3
        • 2.Sf8#

Anticipated by 2806(0000)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(c);N_GUARD,P-FLIGHT,P_PINR(D)::R(F)+S(E),DCHECK
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • Q(g);XR(F)::QAB1(B)
        • R(f);XR(F)::QAB1(B)
      • Refutation
        • K(c);S_FLIGHT,XR(D)
    • Try
      • R(D);CHECK
      • Vars
        • K(c);CHECK,P-FLIGHT::R(F)+S(E),DCHECK
      • Refutation
        • P(d);XR(D)
    • Try
      • R(D);
      • Threat
        • DUALS(2)
      • Vars
        • R(f);N_GUARD::R(F)+S(E)
      • Refutation
        • K(c);CHECK,P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);P-FLIGHT::S(E)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • R(D);
    • Threat
      • R(D)
    • Vars
      • K(c);CHECK,P-FLIGHT::R(F)+S(E),DCHECK
      • Q(g);N_GUARD::R(F)+S(E)
      • R(f);N_GUARD::R(F)+S(E)
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