MESON Chess Problem Database

Problem Display
PID: 209516 (1qb5/1r1pN2K/Qn5R/4k1p1/8/4B2N/n1BP2Rp/b5r1 w - - 0 1)

Osswald, Alfred H

Deutsche Schachblatter, 1942

1qb5/1r1pN2K/Qn5R/4k1p1/8/4B2N/n1BP2Rp/b5r1

#2

9 + 11

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rb1
      • 2.Rxg5#
    • 1...Rc1
      • 2.Rxg5#
    • 1...Rd1
      • 2.Rxg5#
    • 1...Re1
      • 2.Rxg5#
    • 1...Rh1
      • 2.Rxg5#
    • 1...Sc1
      • 2.Qxa1#
    • 1...Sc3
      • 2.d4#
    • 1...Sa4
      • 2.Qf6#
    • 1...Sc4
      • 2.Qf6#
    • 1...Sd5
      • 2.Sg6#
    • 1...Sa8
      • 2.Qf6#
  • Tries
    • 1.Sc6+?
      • 1...Kd5
        • 2.Qb5#
      • 1...dxc6+!
    • 1.Qf1?
      • threat
        • 2.Qf5#
        • 2.Qf6#
      • 1...Qd6
        • 2.Qf5#
      • 1...Sd5
        • 2.Qf5#
      • 1...d5
        • 2.Qf6#
      • 1...d6
        • 2.Qf6#
      • 1...Rxf1!
    • 1.Qd3?
      • threat
        • 2.Qe4#
        • 2.Qf5#
      • 1...Rf1
        • 2.Qe4#
      • 1...Sc3
        • 2.Bd4#
        • 2.Qf5#
        • 2.Qd4#
      • 1...d6
        • 2.Qe4#
      • 1...d5!
    • 1.Qb5+?
      • 1...Sd5
        • 2.Qxd5#
      • 1...d5!
    • 1.Qa5+?
      • 1...Sd5
        • 2.Qxd5#
      • 1...d5!
  • Keys
    • 1.Bf2!
      • threat
        • 2.Qe2#
      • 1...Re1
        • 2.Rxg5#
      • 1...Bd4
        • 2.Bg3#
      • 1...Sc1
        • 2.Qxa1#
      • 1...Sc3
        • 2.d4#
      • 1...Sc4
        • 2.Qf6#
      • 1...Sd5
        • 2.Sg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • R(b);N_GUARD::R(C),XP(f)
    • S(c);OGATE::QAB(F),XB(a)
    • S(c);S_CUTB(a)::P(B)
    • S(g);OGATE::QAB1(F)
    • S(g);SBLOCK::S(H)
  • Tries
    • Try
      • S(H);CHECK
      • Vars
        • K(e);P-FLIGHT::QAR2(F)
      • Refutation
        • P(i);CHECK,XS(H)
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • Q(j);::QAR1(F)
        • S(g);::QAR1(F)
        • P(i);P_PINS(H)::QAB1(F)
      • Refutation
        • R(b);XQ(F)
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);::QAR1(F)
        • P(i);P_PINS(H)::QAR1(F)
      • Refutation
        • P(i);P_PINS(H)
    • Try
      • Q(F);CHECK
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::QAR1(F),XS(g)
      • Refutation
        • P(i);P_PINS(H),P_SPINP(i)
    • Try
      • Q(F);CHECK
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::QAR1(F),XS(g)
      • Refutation
        • P(i);P_PINS(H),P_SPINP(i)
  • Actual
    • B(D);
    • Threat
      • QAR(F)
    • Vars
      • R(b);N_GUARD::R(C),XP(f)
      • B(a);SBLOCK::B(D)
      • S(c);OGATE::QAB(F),XB(a)
      • S(c);S_CUTB(a)::P(B)
      • S(g);OGATE::QAB1(F)
      • S(g);SBLOCK::S(H)
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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).