MESON Chess Problem Database

Problem Display
PID: 176070 (1R5r/Q2n4/NpppP3/8/np1kPB2/3B3b/3K4/8 w - - 0 1)

Freund, W

Schach-Echo, 1937

1R5r/Q2n4/NpppP3/8/np1kPB2/3B3b/3K4/8

#2

8 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sc5
      • 2.Qg7#
    • 1...Se5
      • 2.Be3#
    • 1...Sxb8
      • 2.Qg7#
    • 1...Sf8
      • 2.Qg7#
  • Tries
    • 1.Rxb6?
      • threat
        • 2.Rxb4#
      • 1...Sdxb6
        • 2.Qg7#
      • 1...b3
        • 2.Rb4#
      • 1...Saxb6!
    • 1.Qxd7?
      • threat
        • 2.Qxd6#
        • 2.Qg7#
      • 1...Bxe6
        • 2.Qg7#
      • 1...Rh6
        • 2.Qxd6#
      • 1...Rh7
        • 2.Qxd6#
      • 1...Rd8
        • 2.Qg7#
      • 1...Rf8
        • 2.Qxd6#
      • 1...Rg8
        • 2.Qxd6#
      • 1...Sc3
        • 2.Qg7#
      • 1...d5
        • 2.Qg7#
      • 1...Rh5!
  • Keys
    • 1.Sc5!
      • threat
        • 2.Sb3#
      • 1...Kxc5
        • 2.Be3#
      • 1...Bxe6
        • 2.Sxe6#
      • 1...Saxc5
        • 2.Qa1#
      • 1...Sdxc5
        • 2.Qg7#
      • 1...bxc5
        • 2.Rxb4#
      • 1...dxc5
        • 2.Qxd7#
      • 1...b3
        • 2.Sxb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 3
  • Sets
    • S(h);N_SPINP(e),OGATE::QAB(G)
    • S(h);SBLOCK::B(D)
    • S(h);OGATE,XR(H)::QAB(G)
    • S(h);OGATE::QAB(G)
  • Tries
    • Try
      • R(H);XP(e)
      • Threat
        • QAB(G)+R(H),DCHECK,XP(c)
      • Vars
        • S(h);OGATE,P_SPINS(h),XR(H)::QAB(G)
        • P(c);::QAB(G)+R(H),DCHECK
      • Refutation
        • S(b);P_SPINS(b),XR(H)
    • Try
      • Q(G);N_PINP(e),P_PINP(g),XS(h)
      • Threat
        • DUALS(2)
      • Vars
        • B(a);XP(F)::QAB(G)
        • R(i);::QAR2(G),XP(g)
        • R(i);::QAB(G)
        • S(b);::QAB(G)
        • P(g);::QAB(G)
      • Refutation
        • R(i);
  • Actual
    • S(E);N_PINP(e)
    • Threat
      • S(E)
    • Vars
      • K(d);P_SPINP(e),S_FLIGHT,XS(E)::B(D)
      • B(a);XP(F)::S(E),XB(a)
      • S(b);OGATE,SBLOCK,XS(E)::QAB(G)
      • S(h);OGATE,SBLOCK,XS(E)::QAB(G)
      • P(e);OGATE,P_SPINP(e),XS(E)::R(H),XP(c)
      • P(g);OGATEB,SBLOCK,XS(E)::QAR(G),XS(h)
      • P(c);::S(E),XP(c)
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