MESON Chess Problem Database

Problem Display
PID: 83745 (8/nr4pK/n1p1N1P1/2pN3R/B1k5/P4R2/2r5/Q3bb2 w - - 0 1)

Ellerman, Arnoldo

Norsk Sjakkblad, 1920

8/nr4pK/n1p1N1P1/2pN3R/B1k5/P4R2/2r5/Q3bb2

#2

9 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rd2
      • 2.Rc3#
      • 2.Qc3#
    • 1...Rb6
      • 2.Sxb6#
    • 1...Rc7
      • 2.Sb6#
    • 1...Rd7
      • 2.Sb6#
    • 1...Re7
      • 2.Sb6#
    • 1...Rf7
      • 2.Sb6#
    • 1...Bd2
      • 2.Qxf1#
    • 1...Bd3
      • 2.Se3#
    • 1...Sb5
      • 2.Bb3#
  • Tries
    • 1.Qxe1?
      • threat
        • 2.Qh4#
        • 2.Qe4#
      • 1...Rd2
        • 2.Rc3#
      • 1...Re2
        • 2.Rc3#
        • 2.Qc3#
      • 1...Rf2
        • 2.Rc3#
        • 2.Qc3#
        • 2.Qe4#
      • 1...Rg2
        • 2.Rc3#
        • 2.Qc3#
        • 2.Qe4#
      • 1...Rh2
        • 2.Rc3#
        • 2.Qc3#
        • 2.Qe4#
      • 1...Rf7
        • 2.Sb6#
        • 2.Qe4#
      • 1...Be2
        • 2.Qh4#
      • 1...Bd3
        • 2.Se3#
      • 1...Bh3
        • 2.Qe4#
      • 1...Sb5
        • 2.Bb3#
      • 1...cxd5!
    • 1.Qa2+?
      • 1...Rb3
        • 2.Sb6#
        • 2.Qxb3#
      • 1...Rxa2!
  • Keys
    • 1.Qd1!
      • threat
        • 2.Rf4#
      • 1...cxd5
        • 2.Qxd5#
      • 1...Rd2
        • 2.Rc3#
      • 1...Re2
        • 2.Qd3#
      • 1...Rf2
        • 2.Rh4#
      • 1...Rf7
        • 2.Sb6#
      • 1...Bd2
        • 2.Qxf1#
      • 1...Bf2
        • 2.Qxc2#
      • 1...Bc3
        • 2.Se3#
      • 1...Bg3
        • 2.Qxc2#
      • 1...Bg2
        • 2.Qd3#
      • 1...Bd3
        • 2.Qxd3#
      • 1...Sb5
        • 2.Bb3#

There are these versions: 235613

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 8
    • REMOVED MATES = 4
  • Sets
    • R(i);N_GUARD::S(E),XR(i)
    • R(i);N_GUARD::S(E)
    • B(a);OGATE::QAB(A),XB(b)
    • B(b);P_PINP(H),SBLOCK::S(E)
    • S(h);SBLOCK,S_CUTR(i)::B(D)
  • Tries
    • Try
      • Q(A);XB(a)
      • Threat
        • DUALS(2)
      • Vars
        • R(c);N_GUARD::R1(C)
        • B(b);::QAR(A)
        • B(b);P_PINP(H),SBLOCK::S(E)
        • B(b);::QAR2(A)
        • S(h);SBLOCK,S_CUTR(i)::B(D)
      • Refutation
        • P(g);XS(E)
    • Try
      • Q(A);CHECK
      • Refutation
        • R(c);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • R(C)
    • Vars
      • P(g);OGATE,XS(E)::QAB1(A),XP(g)
      • R(c);N_GUARD,S_CUTB(a)::R1(C)
      • R(c);S_CUTB(b)::QAB1(A)
      • R(c);S_CUTB(a)::R(F)
      • R(i);N_GUARD::S(E)
      • B(a);OGATE::QAB(A),XB(b)
      • B(a);N_GUARD::QAR2(A),XR(c)
      • B(a);SBLOCK::S(E)
      • B(b);N_GUARD::QAB1(A)
      • B(b);N_GUARD,P_PINP(H)::QAB1(A),XB(b)
      • S(h);SBLOCK,S_CUTR(i)::B(D)
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