MESON Chess Problem Database

Problem Display
PID: 221803 (N7/P1q1P3/P1k2Nb1/p1P2p2/K1p3p1/4B2p/2Q5/4b3 w - - 0 1)

Atayants, Grigory Sergeevich

ChessStar, 2013

N7/P1q1P3/P1k2Nb1/p1P2p2/K1p3p1/4B2p/2Q5/4b3

#2

9 + 9

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qb8
      • 2.axb8S#
    • 1...Qd8
      • 2.exd8S#
    • 1...h2
      • 2.Qg2#
  • Tries
    • 1.Qd1?
      • threat
        • 2.Qd5#
      • 1...Qe5
        • 2.Qd7#
      • 1...Qd6
        • 2.Qxd6#
      • 1...Qd8
        • 2.exd8S#
      • 1...Qd7
        • 2.Qxd7#
      • 1...Bd2
        • 2.Qh1#
      • 1...Bf7!
    • 1.Qb2?
      • threat
        • 2.Qb5#
      • 1...Qb6
        • 2.Qxb6#
      • 1...Qb8
        • 2.axb8S#
      • 1...Qb7
        • 2.Qxb7#
      • 1...Bb4!
    • 1.Qxc4?
      • threat
        • 2.Qb5#
        • 2.Qd5#
      • 1...Bf7
        • 2.Qb5#
      • 1...Qe5
        • 2.Qb5#
      • 1...Qb6
        • 2.Qd5#
        • 2.Qe6#
      • 1...Qd6
        • 2.Qb5#
      • 1...Qb8
        • 2.Qd5#
        • 2.axb8S#
      • 1...Qd8
        • 2.Qb5#
        • 2.exd8S#
      • 1...Qb7
        • 2.Qd5#
        • 2.Qe6#
      • 1...Qd7
        • 2.Qb5#
      • 1...Qf4!
    • 1.e8Q+?
      • 1...Qd7
        • 2.Qxd7#
      • 1...Bxe8!
    • 1.e8B+?
      • 1...Qd7
        • 2.Bxd7#
      • 1...Bxe8!
  • Keys
    • 1.Qb1!
      • threat
        • 2.Qb5#
      • 1...Qb6
        • 2.Qxb6#
      • 1...Qb8
        • 2.axb8S#
      • 1...Qb7
        • 2.Qxb7#
      • 1...Bb4
        • 2.Qh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(i);OGATE::PXQ(i)=S
    • P(b);N_GUARD::QAB(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • Q(i);N_GUARD::QAB1(A)
        • Q(i);N_GUARD::QAR1(A),XQ(i)
        • Q(i);OGATE::PXQ(i)=S
        • Q(i);N_GUARD::QAB1(A),XQ(i)
        • B(a);OGATE::QAB(A)
      • Refutation
        • B(h);
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • Q(i);N_GUARD::QAR1(A),XQ(i)
        • Q(i);OGATE::PXQ(i)=S
        • Q(i);N_GUARD::QAB1(A),XQ(i)
      • Refutation
        • B(a);
    • Try
      • Q(A);XP(c)
      • Threat
        • DUALS(2)
      • Vars
        • B(h);::QAB1(A)
        • Q(i);::QAB1(A)
      • Refutation
        • Q(i);P_PINQ(A)
    • Try
      • P(H);CHECK
      • Vars
        • Q(i);N_GUARD,P_SPINQ(i)::QAB1(H),XQ(i)
      • Refutation
        • B(h);XQ(H)
    • Try
      • P(H);CHECK
      • Vars
        • Q(i);N_GUARD,P_SPINQ(i)::B(H),XQ(i)
      • Refutation
        • B(h);XB(H)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • Q(i);N_GUARD::QAR1(A),XQ(i)
      • Q(i);OGATE::PXQ(i)=S
      • Q(i);N_GUARD::QAB1(A),XQ(i)
      • B(a);OGATE::QAB(A)
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