MESON Chess Problem Database

Problem Display
PID: 180358 (4R3/K2Q3r/1NPBP3/1Np3p1/n3k1P1/4n3/4PP2/7q w - - 0 1)

Lider, Valentin Viktorovich

Sinfonie Scacchistiche, 1983

4R3/K2Q3r/1NPBP3/1Np3p1/n3k1P1/4n3/4PP2/7q

#2

11 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.f3#
    • 1...Qb1
      • 2.f3#
    • 1...Qc1
      • 2.f3#
    • 1...Qd1
      • 2.f3#
    • 1...Qe1
      • 2.f3#
    • 1...Qg1
      • 2.f3#
    • 1...Qh2
      • 2.f3#
    • 1...Qh4
      • 2.f3#
    • 1...Qh5
      • 2.f3#
    • 1...Qh6
      • 2.f3#
    • 1...Rxd7+
      • 2.exd7#
    • 1...Rf7
      • 2.exf7#
  • Tries
    • 1.Qxh7+?
      • 1...Sf5
        • 2.Qxf5#
        • 2.Qxh1#
      • 1...Qxh7+!
    • 1.e7?
      • threat
        • 2.Qe6#
      • 1...Rxe7
        • 2.Rxe7#
        • 2.Qxe7#
      • 1...Sxg4
        • 2.Qxg4#
      • 1...Qa1
        • 2.f3#
      • 1...Qh2
        • 2.f3#
      • 1...Qh6
        • 2.f3#
      • 1...Sc4
        • 2.Qf5#
      • 1...Rh6!
  • Keys
    • 1.Bc7!
      • threat
        • 2.Qd3#
      • 1...Rxd7
        • 2.exd7#
      • 1...Qb1
        • 2.f3#
      • 1...Qd1
        • 2.f3#
      • 1...Sd5
        • 2.Qxd5#
      • 1...Sb2
        • 2.Sc3#
      • 1...c4
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 9
  • Sets
    • Q(a);N_GUARD::P(B)
    • R(g);CHECK,OGATE,XQ(J)::R(K)+P(H),XR(g)
    • R(g);OGATE::R(K)+P(H),XR(g)
  • Tries
    • Try
      • Q(J);CHECK,N_SPINQ(J),XR(g)
      • Refutation
        • Q(a);CHECK,XQ(J)
    • Try
      • P(H);N_SPINQ(J)
      • Threat
        • QAR2(J)
      • Vars
        • S(b);OGATE,XP(C)::QAR2(J),XS(b)
        • Q(a);N_GUARD::P(B)
        • S(b);N_GUARD::QAB1(J)
      • Refutation
        • R(g);
  • Actual
    • B(G);N_SPINQ(J)
    • Threat
      • QAB1(J)
    • Vars
      • R(g);OGATE,P_PINB(G),XQ(J)::R(K)+P(H),XR(g)
      • Q(a);N_GUARD::P(B)
      • S(b);N_GUARD::QAB1(J),XS(b)
      • S(c);N_GUARD::S(D)
      • P(e);N_GUARD::QAR1(J)
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