MESON Chess Problem Database

Problem Display
PID: 203392 (3RK3/3N2p1/3p2pb/P5p1/2Pk1qR1/p3N1B1/P2P4/1Q6 w - - 0 1)

Gulyaev, Aleksandr Pavlovich (aka Grin, AP)

Shakhmaty, 1924

3RK3/3N2p1/3p2pb/P5p1/2Pk1qR1/p3N1B1/P2P4/1Q6

#2

11 + 8

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4+
      • 2.Rxe4#
      • 2.Qxe4#
  • Tries
    • 1.Sf5+?
      • 1...Kxc4
        • 2.Qb3#
      • 1...gxf5!
    • 1.Bxf4?
      • threat
        • 2.Bh2#
        • 2.Bg3#
        • 2.Be5#
        • 2.Bxg5#
        • 2.Bxd6#
      • 1...d5
        • 2.Bh2#
        • 2.Bg3#
        • 2.Be5#
        • 2.Bxg5#
        • 2.Bd6#
        • 2.Bc7#
        • 2.Bb8#
      • 1...gxf4!
    • 1.Qf5?
      • threat
        • 2.Qd5#
      • 1...Qe4+
        • 2.Qxe4#
      • 1...d5
        • 2.Qxd5#
      • 1...gxf5!
    • 1.Qh1?
      • threat
        • 2.Qd5#
      • 1...Qe4+
        • 2.Qxe4#
      • 1...d5
        • 2.Qxd5#
      • 1...Kd3!
    • 1.Qb7?
      • threat
        • 2.Qd5#
      • 1...Qe4+
        • 2.Qxe4#
      • 1...d5
        • 2.Qxd5#
      • 1...Kd3!
  • Keys
    • 1.Sc5!
      • 1...Qe4+
        • 2.Se6#
      • 1...Kxc5
        • 2.Qb6#
      • 1...Ke5
        • 2.Qa1#
      • 1...Qxg4
        • 2.Sb3#
      • 1...d5
        • 2.Rxd5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(b);P-FLIGHT,XP(F)::QAB1(A)
      • Refutation
        • P(f);XS(D)
    • Try
      • B(E);XQ(c)
      • Threat
        • DUALS(5)
      • Refutation
        • P(d);P_SPINP(d),XB(E)
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • Q(c);CHECK,N_GUARD::QAR1(A),XQ(c)
        • P(e);::QAR1(A),XP(e)
      • Refutation
        • P(f);XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • Q(c);CHECK,N_GUARD::QAR1(A),XQ(c)
        • P(e);::QAR1(A),XP(e)
      • Refutation
        • K(b);N_SPINQ(c),P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • Q(c);CHECK,N_GUARD::QAR1(A),XQ(c)
        • P(e);::QAR1(A),XP(e)
      • Refutation
        • K(b);N_SPINQ(c),P-FLIGHT
  • Actual
    • S(I);P_PINP(e)
    • Vars
      • Q(c);CHECK::S(I)
      • K(b);N_SPINP(e),N_SPINQ(c),OGATEB,S_FLIGHT,XS(I)::QAB1(A)
      • K(b);N_SPINP(e),S_FLIGHT::QAB(A)
      • Q(c);N_SPINQ(c),XR(G)::S(I)
      • P(e);OGATE::R1(J),XP(e)
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