MESON Chess Problem Database

Problem Display
PID: 203378 (5B1K/8/8/pN2Q3/k7/p7/nrP5/b2B4 w - - 0 1)

Vesz, Tibor

Good Companions, 1924

5B1K/8/8/pN2Q3/k7/p7/nrP5/b2B4

#2

6 + 6

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc2
      • 2.Bxc2#
    • 1...Rb3
      • 2.cxb3#
    • 1...Sc1
      • 2.Sc3#
    • 1...Sc3
      • 2.Sxc3#
    • 1...Sb4
      • 2.Sc3#
  • Tries
    • 1.Qxb2?
      • threat
        • 2.c3#
        • 2.c4#
      • 1...axb2
        • 2.c4#
      • 1...Sb4
        • 2.Sc3#
      • 1...Sc1
        • 2.Sc3#
      • 1...Sc3
        • 2.Sxc3#
        • 2.Qb3#
      • 1...Bxb2+!
    • 1.c3+?
      • 1...Rc2
        • 2.Bxc2#
      • 1...Rb3!
    • 1.c4+?
      • 1...Rc2
        • 2.Bxc2#
      • 1...Rb3!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Sc3#
      • 1...Rxc2+
        • 2.Sd4#
      • 1...Rxb5+
        • 2.c3#
      • 1...Sc3
        • 2.Sxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • R(c);OGATE,P_PINQ(D),P_SPINR(c),XP(B)::B(A),XR(c)
    • R(c);OGATE,P_PINQ(D)::P(B),XR(c)
    • S(b);N_GUARD::S(C)
    • S(b);N_GUARD::S(C),XS(b)
  • Tries
    • Try
      • Q(D);P_SPINQ(D),XR(c)
      • Threat
        • DUALS(2)
      • Vars
        • P(d);XQ(D)::B(A)+P(B)
        • S(b);N_GUARD::S(C)
      • Refutation
        • B(a);CHECK,XQ(D)
    • Try
      • P(B);CHECK
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::B(A),XR(c)
      • Refutation
        • R(c);P_SPINR(c)
    • Try
      • P(B);CHECK
      • Vars
        • R(c);N_GUARD,P_PINQ(D),P_SPINR(c)::B(A),XR(c)
      • Refutation
        • R(c);P_PINQ(D),P_SPINR(c)
  • Actual
    • Q(D);
    • Threat
      • QAB(D)+S(C),DCHECK
    • Vars
      • R(c);CHECK,N_GUARD,P_SPINR(c),XP(B)::QAB(D)+S(C)
      • R(c);CHECK,N_GUARD,P_SPINR(c),XS(C)::B(A)+P(B)
      • S(b);::QAB(D)+S(C),DCHECK,XS(b)
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