MESON Chess Problem Database

Problem Display
PID: 235624 (1q2R3/3pnN2/b5PK/2bp4/R1n1kp2/r1p4B/2P1NPPB/5Q2 w - - 0 1)

Ellerman, Arnoldo

Norsk Sjakkblad, 1953

1q2R3/3pnN2/b5PK/2bp4/R1n1kp2/r1p4B/2P1NPPB/5Q2

#2

12 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Be3
      • 2.f3#
    • 1...f3
      • 2.Sg5#
    • 1...d6
      • 2.Rxe7#
  • Tries
    • 1.Sc1?
      • threat
        • 2.Qd3#
      • 1...Kd4
        • 2.Qd3#
      • 1...d4!
    • 1.Sg1?
      • threat
        • 2.Qd3#
      • 1...Kd4
        • 2.Qd3#
      • 1...d4!
    • 1.Sxc3+?
      • 1...Kd4
        • 2.Qd3#
      • 1...Rxc3!
    • 1.Sg3+?
      • 1...Kd4
        • 2.Qd3#
        • 2.Qd1#
      • 1...fxg3!
    • 1.Sxf4?
      • threat
        • 2.Qd3#
      • 1...Kd4
        • 2.Qd3#
      • 1...Qxf4+!
    • 1.Rxe7+?
      • 1...Qe5
        • 2.Sg5#
        • 2.Rxe5#
      • 1...Bxe7!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Qd3#
      • 1...Kxd4
        • 2.Qd3#
      • 1...Sb2
        • 2.Bf5#
      • 1...Sd2
        • 2.Bf5#
      • 1...Se3
        • 2.f3#
      • 1...Sa5
        • 2.Bf5#
      • 1...Se5
        • 2.Sg5#
      • 1...Sb6
        • 2.Bf5#
      • 1...Sd6
        • 2.Rxe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 3
  • Sets
    • B(f);SBLOCK::P(D)
    • P(e);::S(K)
    • P(i);S_CUTB(f),S_CUTQ(k)::R(L),XS(j)
  • Tries
    • Try
      • S(C);
      • Threat
        • QAB1(A)
      • Vars
        • K(d);P-FLIGHT::QAR1(A)
      • Refutation
        • P(g);N_SPINS(c),P_SPINS(j)
    • Try
      • S(C);
      • Threat
        • QAB1(A)
      • Vars
        • K(d);P-FLIGHT::QAR1(A)
      • Refutation
        • P(g);N_SPINS(c),P_SPINS(j)
    • Try
      • S(C);CHECK,XP(b)
      • Vars
        • K(d);P-FLIGHT::QAR1(A)
      • Refutation
        • R(a);XS(C)
    • Try
      • S(C);CHECK
      • Refutation
        • P(e);XS(C)
    • Try
      • S(C);XP(e)
      • Threat
        • QAB1(A)
      • Vars
        • K(d);P-FLIGHT::QAR1(A)
      • Refutation
        • Q(k);CHECK,XS(C)
    • Try
      • R(L);CHECK,XS(j)
      • Refutation
        • B(f);XR(L)
  • Actual
    • S(C);N_PINS(c),P_PINS(j)
    • Threat
      • QAB1(A)
    • Vars
      • K(d);N_SPINS(j),P-FLIGHT,P_SPINS(c),XS(C)::QAR1(A)
      • S(c);::B(G)
      • S(c);SBLOCK::P(D)
      • S(c);N_SPINS(j),SBLOCK::S(K)
      • S(c);N_GUARD,S_CUTB(f),S_CUTQ(k)::R(L),XS(j)
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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).