MESON Chess Problem Database

Problem Display
PID: 173108 (2n4B/1Qb1N3/3P4/R1qp3K/R1B1k3/2P1p3/n3NpPp/7r w - - 0 1)

Barulin, Mikhail Mikhailovich

1st HM., Shakhmaty, 1926

2n4B/1Qb1N3/3P4/R1qp3K/R1B1k3/2P1p3/n3NpPp/7r

#2

11 + 10

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qa3
      • 2.Qxd5#
    • 1...Qb4
      • 2.Qxd5#
    • 1...Qb6
      • 2.Qxd5#
    • 1...Qa7
      • 2.Qxd5#
    • 1...Qxc4
      • 2.Qxd5#
    • 1...Rb1
      • 2.Qxb1#
    • 1...f1S
      • 2.Qb1#
    • 1...f1B
      • 2.Qb1#
  • Tries
    • 1.Bxa2+?
      • 1...Qb4
        • 2.Qxd5#
      • 1...Qd4
        • 2.Rxd4#
      • 1...Qc4
        • 2.Qxd5#
      • 1...Kd3!
    • 1.Bb3+?
      • 1...Qb4
        • 2.Bc2#
        • 2.Qxd5#
      • 1...Qd4
        • 2.Bc2#
        • 2.Rxd4#
      • 1...Qc4
        • 2.Bc2#
        • 2.Qxd5#
      • 1...Sb4
        • 2.Bc2#
      • 1...Kd3!
    • 1.Bb5+?
      • 1...Qb4
        • 2.Qxd5#
      • 1...Qd4
        • 2.Rxd4#
        • 2.Qxd5#
      • 1...Qc4
        • 2.Qxd5#
      • 1...Sb4!
    • 1.Ba6+?
      • 1...Qb4
        • 2.Qxd5#
      • 1...Qd4
        • 2.Rxd4#
        • 2.Qxd5#
      • 1...Qc4
        • 2.Qxd5#
      • 1...Sb4!
  • Keys
    • 1.Sxd5!
      • threat
        • 2.Sg3#
      • 1...Qxd5+
        • 2.Qxd5#
      • 1...Kf5
        • 2.Sxe3#
      • 1...Qxd6
        • 2.Sf6#
      • 1...Qxc4
        • 2.Sdf4#
      • 1...Bxd6
        • 2.Qh7#
      • 1...f1S
        • 2.Qb1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • Q(g);N_GUARD::QAB1(I),XP(h)
    • Q(g);N_GUARD,P_SPINQ(g),XB(E)::QAB1(I),XP(h)
    • R(a);N_GUARD::QAB(I),XR(a)
    • P(c);S_CUTR(a)::QAB(I)
  • Tries
    • Try
      • B(E);CHECK,XS(b)
      • Vars
        • Q(g);P_SPINQ(g)::QAB1(I),XP(h)
        • Q(g);N_GUARD,P_SPINQ(g)::R1(D),XQ(g)
      • Refutation
        • K(f);N_SPINP(h),S_FLIGHT
    • Try
      • B(E);CHECK
      • Vars
        • S(b);P_SPINS(b)::B(E)
      • Refutation
        • K(f);N_SPINP(h),S_FLIGHT
    • Try
      • B(E);CHECK
      • Vars
        • Q(g);P_SPINQ(g)::QAB1(I),XP(h)
      • Refutation
        • S(b);P_SPINS(b)
    • Try
      • B(E);CHECK
      • Vars
        • Q(g);P_SPINQ(g)::QAB1(I),XP(h)
      • Refutation
        • S(b);P_SPINS(b)
  • Actual
    • S(J);P_SPINS(J),XP(h)
    • Threat
      • S(A)
    • Vars
      • Q(g);CHECK,OGATE,P_SPINQ(g),XS(J)::QAB1(I),XQ(g)
      • K(f);N_PINS(J),S_FLIGHT::S(J),XP(e)
      • Q(g);N_PINS(J),XP(H)::QAB(I)+S(J),DCHECK
      • Q(g);N_PINS(J),P_SPINQ(g),XB(E)::QAB(I)+S(J)
      • B(i);OGATE,XP(H)::QAB(I)
      • P(c);S_CUTR(a)::QAB(I)
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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).