MESON Chess Problem Database

Problem Display
PID: 189354 (4K3/b2p4/b4R1p/4k3/r3P2Q/7P/2NB2pq/8 w - - 0 1)

Malakhov, Nikolai Konstantinovich

1st Prize, Izvestia, 1923

4K3/b2p4/b4R1p/4k3/r3P2Q/7P/2NB2pq/8

#2

7 + 8

16265 The Two-move Chess Problem in the Soviet Union 1923-1943 1943

SOLUTION

  • SOUND
  • Sets
    • 1...Qg1
      • 2.Qf4#
    • 1...Qf4
      • 2.Qxf4#
    • 1...Qh1
      • 2.Qf4#
    • 1...Qxh3
      • 2.Qf4#
  • Tries
    • 1.Ke7?
      • threat
        • 2.Rf5#
      • 1...Qxh3
        • 2.Qf4#
      • 1...Rxe4
        • 2.Qh5#
      • 1...Qf4
        • 2.Qxf4#
      • 1...Bc5+!
    • 1.Bf4+?
      • 1...Qxf4
        • 2.Qxf4#
      • 1...Kxe4!
    • 1.Rf5+?
      • 1...Ke6
        • 2.Qf6#
        • 2.Qe7#
        • 2.Qxh6#
      • 1...Kd6!
    • 1.Re6+?
      • 1...Kxe6
        • 2.Qe7#
      • 1...dxe6!
    • 1.Qf2?
      • threat
        • 2.Qf5#
      • 1...Kxe4
        • 2.Qf5#
      • 1...Qxh3
        • 2.Qf4#
      • 1...Qf4
        • 2.Qxf4#
      • 1...Bxf2!
    • 1.Qg5+?
      • 1...Kxe4
        • 2.Qf5#
      • 1...hxg5!
    • 1.Qg4?
      • threat
        • 2.Qf5#
      • 1...Qxh3
        • 2.Qf4#
      • 1...Qf4
        • 2.Qxf4#
      • 1...Kxf6!
    • 1.Qh5+?
      • 1...Kxe4
        • 2.Qf5#
      • 1...Kxf6!
  • Keys
    • 1.Rb6!
      • threat
        • 2.Qe7#
      • 1...Qxh3
        • 2.Qf4#
      • 1...Rxe4
        • 2.Qh5#
      • 1...Bc4
        • 2.Bc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • Q(b);N_GUARD::QAB1(E)
    • Q(b);N_GUARD::QAB1(E),XQ(b)
    • Q(b);N_GUARD,XP(C)::QAB1(E)
  • Tries
    • Try
      • K(G);P-FLIGHT
      • Threat
        • R1(F)
      • Vars
        • Q(b);N_GUARD,XP(C)::QAB1(E)
        • R(c);SBLOCK,XP(D)::QAR(E)
        • Q(b);N_GUARD::QAB1(E),XQ(b)
      • Refutation
        • B(g);CHECK
    • Try
      • B(B);CHECK
      • Vars
        • Q(b);OGATE,XB(B)::QAB1(E),XQ(b)
      • Refutation
        • K(d);P-FLIGHT,XP(D)
    • Try
      • R(F);CHECK
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • R(F);CHECK
      • Vars
        • K(d);P-FLIGHT,XR(F)::QAR1(E)
      • Refutation
        • P(h);XR(F)
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • K(d);P-FLIGHT,XP(D)::QAB1(E)
        • Q(b);N_GUARD,XP(C)::QAB1(E)
        • Q(b);N_GUARD::QAB1(E),XQ(b)
      • Refutation
        • B(g);XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • K(d);P-FLIGHT,XP(D)::QAB1(E)
      • Refutation
        • P(f);XQ(E)
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • Q(b);N_GUARD,XP(C)::QAB1(E)
        • Q(b);N_GUARD::QAB1(E),XQ(b)
      • Refutation
        • K(d);S_FLIGHT,XR(F)
    • Try
      • Q(E);CHECK
      • Vars
        • K(d);P-FLIGHT,XP(D)::QAB1(E)
      • Refutation
        • K(d);S_FLIGHT,XR(F)
  • Actual
    • R(F);
    • Threat
      • QAR2(E)
    • Vars
      • Q(b);N_GUARD,XP(C)::QAB1(E)
      • R(c);SBLOCK,XP(D)::QAR(E)
      • B(e);S_CUTR(c)::B(B)
HTML5 logo

Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).