MESON Chess Problem Database

Problem Display
PID: 176134 (q1n5/3B3K/7B/1N3R2/1bppk3/r7/QN2b3/2n5 w - - 0 1)

Freund, W

Schach-Echo, 1938

q1n5/3B3K/7B/1N3R2/1bppk3/r7/QN2b3/2n5

#2

7 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rb3
      • 2.Qxa8#
    • 1...Rc3
      • 2.Qxa8#
    • 1...Rd3
      • 2.Qxa8#
    • 1...Re3
      • 2.Qxa8#
    • 1...Rf3
      • 2.Qxa8#
    • 1...Rg3
      • 2.Qxa8#
    • 1...Rh3
      • 2.Qxa8#
    • 1...c3
      • 2.Qe6#
    • 1...d3
      • 2.Qxc4#
  • Tries
    • 1.Qxc4?
      • threat
        • 2.Qe6#
        • 2.Qxd4#
      • 1...Qd5
        • 2.Qxd5#
      • 1...Qc6
        • 2.Qxd4#
        • 2.Qxc6#
      • 1...Qa6
        • 2.Qd5#
        • 2.Qxd4#
      • 1...Qa7
        • 2.Qd5#
        • 2.Qe6#
        • 2.Qc6#
      • 1...Qb8
        • 2.Qd5#
        • 2.Qxd4#
        • 2.Qc6#
      • 1...Rd3
        • 2.Qe6#
      • 1...Ra6
        • 2.Qxd4#
      • 1...Bc3
        • 2.Qe6#
      • 1...Bc5
        • 2.Qe6#
      • 1...Bd6
        • 2.Qxd4#
      • 1...Sb3
        • 2.Qxe2#
        • 2.Qe6#
      • 1...Sd3
        • 2.Qxd4#
      • 1...Bxc4!
  • Keys
    • 1.Sd3!
      • threat
        • 2.Sf2#
      • 1...Kxd3
        • 2.Qb1#
      • 1...Rxd3
        • 2.Qxa8#
      • 1...Bxd3
        • 2.Qg2#
      • 1...Sxd3
        • 2.Qxe2#
      • 1...cxd3
        • 2.Qe6#
      • 1...Be1
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 8
  • Sets
    • R(c);OGATE::QAB(A),XQ(h)
    • R(c);OGATE,P_PINB(E)::QAB(A),XQ(h)
    • P(e);OGATE::QAR2(A)
    • P(f);OGATEB::QAR2(A),XP(e)
  • Tries
    • Try
      • Q(A);P_PINP(f),XP(e)
      • Threat
        • DUALS(2)
      • Vars
        • Q(h);N_GUARD::QAB1(A),XQ(h)
        • R(c);::QAR2(A)
        • R(c);::QAR1(A),XP(f)
        • B(d);::QAR2(A)
        • B(d);::QAR1(A),XP(f)
        • S(a);::QAR1(A),XP(f)
      • Refutation
        • B(b);N_SPINP(f),XQ(A)
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • K(g);OGATEB,S_FLIGHT,XS(B)::QAB(A)
      • R(c);OGATE,SBLOCK,XS(B)::QAB(A),XQ(h)
      • B(b);OGATE,SBLOCK,XS(B)::QAB(A)
      • S(a);N_GUARD,XS(B)::QAR2(A),XB(b)
      • P(e);OGATE,SBLOCK,XS(B)::QAR2(A)
      • B(d);N_GUARD::S(B)
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