MESON Chess Problem Database

Problem Display
PID: 175619 (8/8/1N6/7K/5B2/8/P1R5/rkqN2QB w - - 0 1)

Wainwright, Joseph CJ

Boston Sunday Post, 1900

8/8/1N6/7K/5B2/8/P1R5/rkqN2QB

#2

8 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kxc2
      • 2.Be4#
    • 1...Qb2
      • 2.Rxb2#
    • 1...Qe3
      • 2.Sxe3#
    • 1...Qxd1+
      • 2.Qxd1#
    • 1...Rxa2
      • 2.Rxc1#
  • Tries
    • 1.Se3?
      • threat
        • 2.Qxc1#
      • 1...Qd1+
        • 2.Qxd1#
      • 1...Qe1
        • 2.Qxe1#
      • 1...Qf1
        • 2.Qxf1#
      • 1...Qxg1!
    • 1.Be4?
      • threat
        • 2.Sc3#
        • 2.Rb2#
      • 1...Qxd1+
        • 2.Re2#
        • 2.Qxd1#
      • 1...Qxf4
        • 2.Sc3#
      • 1...Rxa2
        • 2.Rxc1#
      • 1...Qb2
        • 2.Sc3#
        • 2.Rxb2#
      • 1...Qd2
        • 2.Sc3#
      • 1...Qe3
        • 2.Sc3#
        • 2.Sxe3#
      • 1...Qxc2!
  • Keys
    • 1.Sc4!
      • 1...Qxd1+
        • 2.Qxd1#
      • 1...Kxc2
        • 2.Be4#
      • 1...Qxf4
        • 2.Sa3#
      • 1...Qxc2
        • 2.Sc3#
      • 1...Rxa2
        • 2.Rxc1#
      • 1...Qb2
        • 2.Rxb2#
      • 1...Qd2
        • 2.Sa3#
      • 1...Qa3
        • 2.Sxa3#
      • 1...Qe3
        • 2.Sdxe3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(b);OGATEB,S_FLIGHT,XR(E)::B(C)
    • Q(c);N_GUARD::R1(E),XQ(c)
    • Q(c);::QAR(B)+S(A),XQ(c)
    • Q(c);CHECK,OGATE,P_SPINQ(c),XS(A)::QAR2(B),XQ(c)
    • R(a);SBLOCK,XP(D)::R1(E),XQ(c)
  • Tries
    • Try
      • S(A);P_PINQ(c)
      • Threat
        • QAR1(B),XQ(c)
      • Vars
        • Q(c);CHECK,OGATEB::QAR2(B),XQ(c)
        • Q(c);OGATEB::QAR(B),XQ(c)
      • Refutation
        • Q(c);N_SPINQ(c),XQ(B)
    • Try
      • B(C);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);XB(F)::QAR(B)+S(A),DCHECK
        • R(a);SBLOCK,XP(D)::B(C)+R(E),DCHECK,XQ(c)
        • Q(c);::QAR(B)+S(A),DCHECK
      • Refutation
        • Q(c);P_SPINQ(c),XR(E)
  • Actual
    • S(H);
    • Vars
      • Q(c);CHECK,OGATE,P_SPINQ(c),XS(A)::QAR2(B),XQ(c)
      • K(b);OGATEB,S_FLIGHT,XR(E)::B(C)
      • Q(c);N_GUARD,XB(F)::S(H)
      • Q(c);SBLOCK,XR(E)::QAR(B)+S(A),DCHECK
      • R(a);SBLOCK,XP(D)::R1(E),XQ(c)
      • Q(c);N_GUARD::R1(E),XQ(c)
      • Q(c);N_GUARD::S(H)
      • Q(c);N_GUARD::S(H),XQ(c)
      • Q(c);::QAR(B)+S(A),XQ(c)
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