MESON Chess Problem Database

Problem Display
PID: 205507 (7Q/4b3/3N4/5R1B/5n1k/8/8/5KN1 w - - 0 1)

Gulyaev, Aleksandr Pavlovich (aka Grin, AP)

Shakhmaty, 1925

7Q/4b3/3N4/5R1B/5n1k/8/8/5KN1

#2

6 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Bd1+?
      • 1...Kg3
        • 2.Se4#
      • 1...Sh5!
    • 1.Be2+?
      • 1...Kg3
        • 2.Se4#
      • 1...Sh5!
    • 1.Bf3+?
      • 1...Kg3
        • 2.Se4#
      • 1...Sh5!
    • 1.Rxf4+?
      • 1...Kg5
        • 2.Sh3#
        • 2.Rg4#
      • 1...Kg3!
    • 1.Qd4?
      • threat
        • 2.Qf2#
        • 2.Qxf4#
      • 1...Kg3
        • 2.Qf2#
        • 2.Qxf4#
      • 1...Bxd6
        • 2.Qf2#
      • 1...Bg5!
  • Keys
    • 1.Rg5!
      • threat
        • 2.Rg4#
      • 1...Kxg5
        • 2.Sf3#
      • 1...Bxg5
        • 2.Sf5#
      • 1...Sxh5
        • 2.Qxh5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(D);CHECK
      • Vars
        • K(b);S_FLIGHT::S(E)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • B(D);CHECK
      • Vars
        • K(b);S_FLIGHT::S(E)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • B(D);CHECK
      • Vars
        • K(b);S_FLIGHT::S(E)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • R(C);CHECK,XS(a)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(F);P_PINS(a)
      • Threat
        • DUALS(2)
      • Vars
        • B(c);XS(E)::QAB(F)
      • Refutation
        • B(c);
  • Actual
    • R(C);
    • Threat
      • R1(C)
    • Vars
      • K(b);S_FLIGHT,XR(C)::S(B)
      • B(c);SBLOCK,XR(C)::S(E)
      • S(a);OGATE,P_SPINS(a),XB(D)::QAR1(F),XS(a)
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