MESON Chess Problem Database

Problem Display
PID: 203359 (3R4/5pn1/b2pkP2/6p1/2PPp1P1/K7/8/5Q2 w - - 0 1)

Malakhov, Nikolai Konstantinovich

Shakhmaty, 1924

3R4/5pn1/b2pkP2/6p1/2PPp1P1/K7/8/5Q2

#2

7 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sf5
      • 2.Qxf5#
    • 1...Sh5
      • 2.Qf5#
    • 1...Se8
      • 2.Qf5#
    • 1...d5
      • 2.cxd5#
  • Tries
    • 1.Re8+?
      • 1...Sxe8
        • 2.Qf5#
      • 1...Kd7!
    • 1.Qf4?
      • threat
        • 2.Rxd6#
        • 2.Qxd6#
        • 2.d5#
      • 1...Bxc4
        • 2.Rxd6#
        • 2.Qxd6#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Bb7
        • 2.Rxd6#
        • 2.Qxd6#
      • 1...Se8
        • 2.Qf5#
        • 2.d5#
      • 1...d5
        • 2.Rd6#
        • 2.Qe5#
        • 2.Qd6#
        • 2.cxd5#
      • 1...gxf4!
  • Keys
    • 1.c5!
      • threat
        • 2.Rxd6#
      • 1...Kd5
        • 2.Rxd6#
      • 1...dxc5
        • 2.Qxa6#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Se8
        • 2.Qf5#
      • 1...d5
        • 2.Rd6#
        • 2.Qxa6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • S(g);N_GUARD::QAB1(A),XS(g)
    • S(g);N_GUARD::QAB1(A)
    • P(d);OGATE::P(C),XP(d)
  • Tries
    • Try
      • R(G);CHECK
      • Vars
        • S(g);XR(G)::QAB1(A)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • S(g);N_GUARD::QAB1(A),XS(g)
      • Refutation
        • P(b);XQ(A)
  • Actual
    • P(C);
    • Threat
      • R1(G),XP(d)
    • Vars
      • K(e);P_SPINP(d),S_FLIGHT::R1(G),XP(d)
      • P(d);OGATEB,XP(C)::QAR(A),XB(c)
      • S(g);N_GUARD::QAB1(A),XS(g)
      • S(g);N_GUARD::QAB1(A)
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