MESON Chess Problem Database

Problem Display
PID: 249321 (8/1K1N2B1/pP1R4/b3P3/1kBp2pq/1p1P1p2/1P2p3/R6Q w - - 0 1)

Moiseev, Vadim Petrovich

Turoverov, Valentin Alekseevich

Schakend Nederland, 1977

8/1K1N2B1/pP1R4/b3P3/1kBp2pq/1p1P1p2/1P2p3/R6Q

#2

11 + 9

15601 Albrecht-Leiss-Degener Collection 2021
3713 Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qe1
      • 2.Qxe1#
    • 1...Qf6
      • 2.Qe1#
    • 1...Qe7
      • 2.Qe1#
    • 1...Qd8
      • 2.Qe1#
    • 1...Qh2
      • 2.Qe1#
    • 1...Qh3
      • 2.Qe1#
    • 1...Qh5
      • 2.Qe1#
    • 1...Qh7
      • 2.Qe1#
    • 1...Qh8
      • 2.Qe1#
    • 1...Bxb6
      • 2.Rxb6#
    • 1...g3
      • 2.Qe1#
  • Tries
    • 1.Sb8?
      • threat
        • 2.Sxa6#
      • 1...Kc5
        • 2.Sxa6#
      • 1...Qe7+!
    • 1.Bxa6?
      • threat
        • 2.Rxd4#
      • 1...Bxb6
        • 2.Rxb6#
      • 1...g3
        • 2.Qe1#
      • 1...Qf2!
    • 1.Rxd4?
      • threat
        • 2.Bxa6#
      • 1...Qf2
        • 2.Bf8#
      • 1...g3
        • 2.Qe1#
      • 1...Bxb6!
    • 1.Rf6?
      • threat
        • 2.Bf8#
      • 1...Qxf6
        • 2.Qe1#
      • 1...Bxb6
        • 2.Rxb6#
      • 1...Qh7
        • 2.Qe1#
      • 1...Qh8
        • 2.Qe1#
      • 1...Qh6!
  • Keys
    • 1.Bf8!
      • threat
        • 2.Rf6#
      • 1...Bxb6
        • 2.Rxb6#
      • 1...Qf6
        • 2.Rxf6#
        • 2.Qe1#
      • 1...Qe7
        • 2.Qe1#
      • 1...Qd8
        • 2.Qe1#
      • 1...Qh6
        • 2.Rxh6#
      • 1...Qh7
        • 2.Qe1#
      • 1...Qh8
        • 2.Qe1#

This anticipates 255933(2007)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • Q(g);N_GUARD::QAB(B),XQ(g)
    • Q(g);N_GUARD::QAB(B)
    • Q(g);N_GUARD,P_PINS(J)::QAB(B)
    • B(h);OGATE,XP(G)::R(H),XB(h)
    • P(f);S_CUTQ(g)::QAB(B)
  • Tries
    • Try
      • S(J);
      • Threat
        • S(J),XP(i)
      • Vars
        • K(d);S_FLIGHT::S(J),XP(i)
      • Refutation
        • Q(g);CHECK
    • Try
      • B(E);XP(i)
      • Threat
        • R(H),XP(e)
      • Vars
        • B(h);OGATE,XP(G)::R(H),XB(h)
        • P(f);S_CUTQ(g)::QAB(B)
      • Refutation
        • Q(g);
    • Try
      • R(H);XP(e)
      • Threat
        • R(H)+B(E),XP(i)
      • Vars
        • Q(g);N_GUARD::B(K)
        • P(f);S_CUTQ(g)::QAB(B)
      • Refutation
        • B(h);XP(G)
    • Try
      • R(H);
      • Threat
        • B(K)
      • Vars
        • Q(g);N_GUARD,XR(H)::QAB(B)
        • B(h);OGATE,XP(G)::R(H),XB(h)
        • Q(g);N_GUARD::QAB(B)
      • Refutation
        • Q(g);
  • Actual
    • B(K);
    • Threat
      • B(K)+R(H)
    • Vars
      • B(h);OGATE,XP(G)::B(K)+R(H),DCHECK,XB(h)
      • Q(g);N_GUARD,P_PINS(J)::QAB(B)
      • Q(g);N_GUARD::QAB(B)
      • Q(g);N_GUARD::B(K)+R(H),XQ(g)
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