MESON Chess Problem Database

Problem Display
PID: 103767 (8/8/2Q5/8/Kp6/8/kq6/6RR w - - 0 1)

Shakhnazaryan, Albert Serapionovic

Boronekhsky Krestianin, 1993

8/8/2Q5/8/Kp6/8/kq6/6RR

#2

4 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qc2+
      • 2.Qxc2#
    • 1...Qg2
      • 2.Rxg2#
      • 2.Qxg2#
    • 1...Qh2
      • 2.Rxh2#
  • Tries
    • 1.Rg2?
      • 1...Qc2+
        • 2.Rxc2#
        • 2.Qxc2#
      • 1...Qxg2
        • 2.Qxg2#
      • 1...Qd2
        • 2.Rxd2#
      • 1...Qe2
        • 2.Rxe2#
      • 1...Qf2
        • 2.Rxf2#
      • 1...b3!
    • 1.Qd5+?
      • 1...Qb3+
        • 2.Qxb3#
      • 1...b3!
    • 1.Qc4+?
      • 1...Qb3+
        • 2.Qxb3#
      • 1...b3!
    • 1.Qe6+?
      • 1...Qb3+
        • 2.Qxb3#
      • 1...b3!
  • Keys
    • 1.Qg2!
      • threat
        • 2.Ra1#
      • 1...Qc2+
        • 2.Qxc2#
      • 1...Qxg2
        • 2.Rxg2#
      • 1...Qd2
        • 2.Qxd2#
      • 1...Qe2
        • 2.Qxe2#
      • 1...Qf2
        • 2.Qxf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(b);CHECK,OGATEB::QAR2(D),XQ(b)
    • Q(b);OGATEB::R(B),XQ(b)
  • Tries
    • Try
      • R(A);P_PINQ(b)
      • Vars
        • Q(b);N_SPINQ(b),OGATE,XR(A)::QAR(D),XQ(b)
        • Q(b);OGATEB::R(A),XQ(b)
      • Refutation
        • P(c);
    • Try
      • Q(D);CHECK
      • Vars
        • Q(b);CHECK,N_GUARD,P_SPINQ(b)::QAB1(D),XQ(b)
      • Refutation
        • P(c);P_SPINP(c)
    • Try
      • Q(D);CHECK
      • Vars
        • Q(b);CHECK,N_GUARD,P_SPINQ(b)::QAB1(D),XQ(b)
      • Refutation
        • P(c);P_SPINP(c)
    • Try
      • Q(D);CHECK
      • Vars
        • Q(b);CHECK,N_GUARD,P_SPINQ(b)::QAB1(D),XQ(b)
      • Refutation
        • P(c);P_SPINP(c)
  • Actual
    • Q(D);P_PINQ(b)
    • Threat
      • R1(A)
    • Vars
      • Q(b);CHECK,OGATEB::QAR2(D),XQ(b)
      • Q(b);N_SPINQ(b),OGATE,XQ(D)::R(A),XQ(b)
      • Q(b);OGATEB::QAR(D),XQ(b)
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