MESON Chess Problem Database

Problem Display
PID: 160727 (8/8/8/3Q3q/3n4/8/6R1/3RK2k w - - 0 1)

Antipov, Viacheslav Pavlovich

Sa ogneupory, 1987

8/8/8/3Q3q/3n4/8/6R1/3RK2k

#2

4 + 3

15148 Sadier Collection 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Qg6
      • 2.Kd2#
      • 2.Kf2#
    • 1...Qh3
      • 2.Kd2#
      • 2.Kf2#
    • 1...Qxd5
      • 2.Kf2#
    • 1...Qg5
      • 2.Kf2#
    • 1...Qh6
      • 2.Kf2#
    • 1...Qh7
      • 2.Kd2#
      • 2.Kf2#
    • 1...Qh8
      • 2.Kd2#
      • 2.Kf2#
  • Tries
    • 1.Rg1+?
      • 1...Kh2
        • 2.Qh1#
        • 2.Qg2#
      • 1...Kxg1!
    • 1.Re2+?
      • 1...Kg1
        • 2.Kd2#
        • 2.Qg2#
      • 1...Qf3
        • 2.Kd2#
      • 1...Qxd5
        • 2.Kd2#
      • 1...Sf3+!
    • 1.Rh2+?
      • 1...Kg1
        • 2.Qh1#
        • 2.Qg2#
      • 1...Kxh2!
  • Keys
    • 1.Rf2+!
      • 1...Kg1
        • 2.Qg2#
      • 1...Qf3
        • 2.Kd2#
      • 1...Qxd5
        • 2.Kd2#
      • 1...Sf3+
        • 2.Ke2#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(c);N_GUARD,XQ(D)::R(A)+K(B)
    • Q(c);N_GUARD::R(A)+K(B)
  • Tries
    • Try
      • R(C);CHECK
      • Refutation
        • K(a);P-FLIGHT,XR(C)
    • Try
      • R(C);CHECK
      • Vars
        • Q(c);P_SPINQ(c)::R(A)+K(B)
        • Q(c);XQ(D)::R(A)+K(B)
      • Refutation
        • S(b);CHECK,P_SPINS(b)
    • Try
      • R(C);CHECK
      • Refutation
        • K(a);P-FLIGHT,XR(C)
  • Actual
    • R(C);CHECK
    • Vars
      • K(a);P-FLIGHT::QAR1(D)
      • Q(c);P_SPINQ(c)::R(A)+K(B)
      • Q(c);XQ(D)::R(A)+K(B)
      • S(b);CHECK,P_SPINS(b)::R(A)+K(B)
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