MESON Chess Problem Database

Problem Display
PID: 204527 (7B/7p/8/2p2p2/1N1qp3/8/2B3R1/k2N3K w - - 0 1)

Neunivako, Pavel Efimovich

64 Shakhmatnoe obozrenie, 1925

7B/7p/8/2p2p2/1N1qp3/8/2B3R1/k2N3K

#2

6 + 6

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Bxb2#
    • 1...Qc3
      • 2.Bxc3#
    • 1...Qe5
      • 2.Bxe5#
    • 1...Qf6
      • 2.Bxf6#
    • 1...Qg7
      • 2.Bxg7#
  • Tries
    • 1.Bd3?
      • threat
        • 2.Ra2#
      • 1...cxb4
        • 2.Bxd4#
      • 1...Qb2
        • 2.Bxb2#
      • 1...exd3!
    • 1.Bxe4?
      • threat
        • 2.Ra2#
      • 1...cxb4
        • 2.Bxd4#
      • 1...Qb2
        • 2.Bxb2#
      • 1...fxe4!
    • 1.Rg6?
      • threat
        • 2.Ra6#
      • 1...Qf6
        • 2.Bxf6#
      • 1...hxg6!
  • Keys
    • 1.Rg7!
      • threat
        • 2.Ra7#
      • 1...Qg1+
        • 2.Rxg1#
      • 1...Qxd1+
        • 2.Rg1#
      • 1...Qxg7
        • 2.Bxg7#
      • 1...Qd7
        • 2.Rxd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(b);OGATE::B(F),XQ(b)
    • Q(b);OGATEB::B(F),XQ(b)
  • Tries
    • Try
      • B(C);
      • Threat
        • R1(D)
      • Vars
        • P(d);N_GUARD,XS(E)::B(F),XQ(b)
        • Q(b);OGATE::B(F),XQ(b)
      • Refutation
        • P(c);XB(C)
    • Try
      • B(C);XP(c)
      • Threat
        • R1(D)
      • Vars
        • P(d);N_GUARD,XS(E)::B(F),XQ(b)
        • Q(b);OGATE::B(F),XQ(b)
      • Refutation
        • P(e);XB(C)
    • Try
      • R(D);
      • Threat
        • R(D)
      • Vars
        • Q(b);OGATEB::B(F),XQ(b)
      • Refutation
        • P(f);XR(D)
  • Actual
    • R(D);N_PINQ(b)
    • Threat
      • R(D)
    • Vars
      • Q(b);CHECK,OGATEB::B(F)+R(D),XQ(b)
      • Q(b);CHECK,OGATEB,XS(A)::B(F)+R(D)
      • Q(b);OGATE,P_SPINQ(b),XR(D)::B(F),XQ(b)
      • Q(b);OGATEB::B(F)+R(D),XQ(b)
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