MESON Chess Problem Database

Problem Display
PID: 137617 (2Q1R3/4nK2/1p1p3p/4N1br/R1p1k1Pp/2PrpN2/bnPP3B/5q1B w - - 0 1)

Ellerman, Arnoldo

Shakhmaty, 1931

2Q1R3/4nK2/1p1p3p/4N1br/R1p1k1Pp/2PrpN2/bnPP3B/5q1B

#2

12 + 14

SOLUTION

  • SOUND
  • Sets
    • 1...Qe2
      • 2.Sxg5#
    • 1...Qh3
      • 2.Sxg5#
    • 1...Qa1
      • 2.Se1#
      • 2.Sg1#
      • 2.Sxg5#
    • 1...Qb1
      • 2.Se1#
      • 2.Sg1#
      • 2.Sxg5#
    • 1...Qc1
      • 2.Se1#
      • 2.Sg1#
      • 2.Sxg5#
    • 1...Qd1
      • 2.Sxg5#
    • 1...Qe1
      • 2.Sxe1#
      • 2.Sg1#
      • 2.Sxg5#
    • 1...Qg1
      • 2.Sxg1#
      • 2.Sxg5#
    • 1...Qxf3+
      • 2.Bxf3#
    • 1...Bf6
      • 2.Sg5#
    • 1...Sd5
      • 2.Qf5#
    • 1...Sf5
      • 2.Sxg5#
  • Tries
    • 1.Sxd3?
      • threat
        • 2.Qf5#
        • 2.Qe6#
      • 1...Qxf3+
        • 2.Qf5#
      • 1...Qxh1
        • 2.Qf5#
      • 1...Sxd3
        • 2.Qf5#
      • 1...exd2
        • 2.Qe6#
      • 1...Qg2
        • 2.Qf5#
      • 1...Bf4
        • 2.Sg5#
      • 1...Bf6
        • 2.Sg5#
      • 1...Kd5!
    • 1.Qf5+?
      • 1...Sxf5
        • 2.Sxg5#
      • 1...Kd5!
  • Keys
    • 1.Sxc4!
      • threat
        • 2.Qf5#
        • 2.Qe6#
      • 1...Qxf3+
        • 2.Qf5#
      • 1...Bxc4+
        • 2.Qe6#
      • 1...Kd5
        • 2.Sxb6#
      • 1...Qxh1
        • 2.Qf5#
      • 1...Qg2
        • 2.Qf5#
      • 1...Rd5
        • 2.Sxd6#
      • 1...Bf4
        • 2.Sg5#
      • 1...Bf6
        • 2.Sg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 5
  • Sets
    • Q(a);N_PINS(F)::B(A)+S(F),DCHECK,XB(i)
    • Q(a);CHECK,OGATE,P_SPINQ(a),XS(F)::B(A),XQ(a)
    • B(i);N_PINS(F)::B(A)+S(F),DCHECK
    • S(n);N_GUARD,SBLOCK::QAB1(K)
    • S(n);N_PINS(F)::B(A)+S(F),DCHECK,XB(i)
  • Tries
    • Try
      • S(I);P_PINS(n),XR(d)
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);CHECK,P_SPINQ(a),XS(F)::QAB1(K)
        • Q(a);N_PINS(F),XB(A)::QAB1(K)
        • S(c);XS(I)::QAB1(K)
        • P(e);XP(C)::QAR2(K)
        • Q(a);N_PINS(F)::QAB1(K)
        • B(i);N_PINS(F)::B(A)+S(F),DCHECK
      • Refutation
        • K(g);N_SPINP(f),N_SPINS(n),S_FLIGHT
    • Try
      • Q(K);CHECK,N_SPINS(F)
      • Vars
        • S(n);XQ(K)::B(A)+S(F),DCHECK,XB(i)
      • Refutation
        • K(g);N_SPINP(f),S_FLIGHT
  • Actual
    • S(I);P_PINS(n),XP(f)
    • Threat
      • DUALS(2)
    • Vars
      • Q(a);CHECK,P_PINS(I),P_SPINQ(a),XS(F)::QAB1(K)
      • B(b);CHECK,P_SPINB(b),XS(I)::QAR2(K)
      • K(g);N_SPINS(n),S_FLIGHT::S(I),XP(k)
      • Q(a);N_PINS(F),P_PINS(I),XB(A)::QAB1(K)
      • Q(a);N_PINS(F),P_PINS(I)::QAB1(K)
      • R(d);SBLOCK::R(G)+S(I),DCHECK,XP(l)
      • B(i);N_PINS(F),P_PINS(I)::B(A)+S(F),DCHECK
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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).