MESON Chess Problem Database

Problem Display
PID: 273078 (2Q5/8/3p4/r2PN1Kp/4k1pR/5N2/nR3Pp1/4rb2 w - - 0 1)

Pankratiev, Aleksandr Nikolaevich

Mosiashvili-75 JT (Kudesnik), 2023

2Q5/8/3p4/r2PN1Kp/4k1pR/5N2/nR3Pp1/4rb2

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Re2
      • 2.Qc4#
    • 1...Rxd5
      • 2.Qf5#
    • 1...Bc4
      • 2.Qxc4#
  • Tries
    • 1.Rd2?
      • threat
        • 2.Rd4#
        • 2.Qf5#
      • 1...Rxd5
        • 2.Qf5#
      • 1...dxe5
        • 2.Qf5#
      • 1...Rd1
        • 2.Qf5#
      • 1...Ra4
        • 2.Qf5#
      • 1...Bd3!
    • 1.Re2+?
      • 1...Kxd5
        • 2.Qc4#
      • 1...Rxe2
        • 2.Qc4#
      • 1...Bxe2!
    • 1.Rb4+?
      • 1...Kxd5
        • 2.Rd4#
      • 1...Bc4
        • 2.Qxc4#
      • 1...Sxb4!
    • 1.Rxg4+?
      • 1...Kxd5
        • 2.Rd4#
      • 1...hxg4!
    • 1.Qc2+?
      • 1...Bd3
        • 2.Qxd3#
      • 1...Kxd5!
  • Keys
    • 1.Sxg4!
      • threat
        • 2.Qf5#
      • 1...Rxd5+
        • 2.Sge5#
      • 1...Kd3
        • 2.Qc2#
      • 1...Kxf3
        • 2.Sh2#
        • 2.Qf5#
      • 1...Kxd5
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(a);S_CUTB(b)::QAR2(H)
    • R(g);P_PINS(F),SBLOCK,XP(E)::QAB1(H)
    • B(b);N_GUARD::QAR2(H),XB(b)
  • Tries
    • Try
      • R(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(g);P_PINS(F),XP(E)::QAB1(H)
        • P(i);XS(F)::QAB1(H)
        • R(a);::QAB1(H)
        • R(g);::QAB1(H)
      • Refutation
        • B(b);
    • Try
      • R(A);CHECK
      • Vars
        • K(e);N_SPINP(f),S_FLIGHT,XP(E)::QAB1(H)
        • R(a);XR(A)::QAR2(H)
      • Refutation
        • B(b);XR(A)
    • Try
      • R(A);CHECK
      • Vars
        • K(e);N_SPINP(f),S_FLIGHT,XP(E)::R1(A)
        • B(b);N_GUARD,P_SPINB(b)::QAR2(H),XB(b)
      • Refutation
        • S(c);XR(A)
    • Try
      • R(D);CHECK,XP(f)
      • Vars
        • K(e);OGATE,S_FLIGHT,XP(E)::R1(D)
      • Refutation
        • P(h);XR(D)
    • Try
      • Q(H);CHECK
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAB1(H),XB(b)
      • Refutation
        • K(e);N_SPINP(f),S_FLIGHT,XP(E)
  • Actual
    • S(F);P_SPINP(E),XP(f)
    • Threat
      • QAB1(H)
    • Vars
      • R(g);CHECK,SBLOCK,XP(E)::R(D)+S(F)
      • K(e);N_GUARD,S_CUTB(b),S_FLIGHT::QAB1(H)
      • K(e);N_GUARD,S_FLIGHT,XP(E)::S(F)
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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).