MESON Chess Problem Database

Problem Display
PID: 87850 (8/8/n1R2N2/5p2/2PkpP2/2rPp3/4p3/QK2N3 w - - 0 1)

Thomson, Robert Gavin

American Chess Problemist, 1950

8/8/n1R2N2/5p2/2PkpP2/2rPp3/4p3/QK2N3

#2

8 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sb4
      • 2.Qa7#
    • 1...Sc5
      • 2.Rd6#
    • 1...Sc7
      • 2.Qa7#
    • 1...Sb8
      • 2.Qa7#
    • 1...exd3
      • 2.Sf3#
  • Tries
    • 1.Sxe4?
      • threat
        • 2.Rd6#
        • 2.Qxc3#
      • 1...Sb4
        • 2.Qxc3#
        • 2.Qa7#
      • 1...Sc7
        • 2.Qxc3#
        • 2.Qa7#
      • 1...fxe4!
    • 1.Sh5?
      • 1...Sb4
        • 2.Qa7#
      • 1...Sc5
        • 2.Rd6#
      • 1...Sc7
        • 2.Qa7#
      • 1...Sb8
        • 2.Qa7#
      • 1...exd3!
    • 1.Sd7?
      • threat
        • 2.Rd6#
      • 1...Sb4
        • 2.Qa7#
      • 1...Sc7
        • 2.Qa7#
      • 1...exd3!
    • 1.Sh7?
      • 1...Sb4
        • 2.Qa7#
      • 1...Sc5
        • 2.Rd6#
      • 1...Sc7
        • 2.Qa7#
      • 1...Sb8
        • 2.Qa7#
      • 1...exd3!
    • 1.Se8?
      • 1...Sb4
        • 2.Qa7#
      • 1...Sc5
        • 2.Rd6#
      • 1...Sc7
        • 2.Qa7#
      • 1...Sb8
        • 2.Qa7#
      • 1...exd3!
    • 1.Sg8?
      • 1...Sb4
        • 2.Qa7#
      • 1...Sc5
        • 2.Rd6#
      • 1...Sc7
        • 2.Qa7#
      • 1...Sb8
        • 2.Qa7#
      • 1...exd3!
    • 1.Rc7?
      • 1...Sxc7
        • 2.Qa7#
      • 1...exd3
        • 2.Sf3#
      • 1...Sb4
        • 2.Qa7#
      • 1...Sb8
        • 2.Qa7#
      • 1...Sc5!
    • 1.Rc8?
      • 1...exd3
        • 2.Sf3#
      • 1...Sc7
        • 2.Qa7#
      • 1...Sb4
        • 2.Qa7#
      • 1...Sb8
        • 2.Qa7#
      • 1...Sc5!
    • 1.Qb2?
      • 1...exd3
        • 2.Sf3#
      • 1...Sc5
        • 2.Rd6#
      • 1...Sc7
        • 2.Qb6#
      • 1...Sb8
        • 2.Qb6#
      • 1...Sb4!
  • Keys
    • 1.Kb2!
      • 1...Rc2+
        • 2.Kxc2#
      • 1...Rb3+
        • 2.Kxb3#
      • 1...Rxd3
        • 2.Sc2#
      • 1...Rxc4
        • 2.Rxc4#
      • 1...exd3
        • 2.Sf3#
      • 1...Rc1
        • 2.Kxc1#
      • 1...Ra3
        • 2.Kxa3#
      • 1...Sb4
        • 2.Qa7#
      • 1...Sc5
        • 2.Rd6#
      • 1...Sc7
        • 2.Qa7#
      • 1...Sb8
        • 2.Qa7#

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(g);OGATE::QAB(A)
    • S(g);SBLOCK::R(G)
    • P(e);N_GUARD,SBLOCK,XP(D)::S(C)
  • Tries
    • Try
      • S(H);XP(e)
      • Threat
        • DUALS(2)
      • Refutation
        • P(f);XS(H)
    • Try
      • S(H);
      • Vars
        • S(g);OGATE::QAB(A)
        • S(g);SBLOCK::R(G)
      • Refutation
        • P(e);XP(D)
    • Try
      • S(H);
      • Threat
        • R(G)
      • Vars
        • S(g);OGATE::QAB(A)
      • Refutation
        • P(e);XP(D)
    • Try
      • S(H);
      • Vars
        • S(g);OGATE::QAB(A)
        • S(g);SBLOCK::R(G)
      • Refutation
        • P(e);XP(D)
    • Try
      • S(H);
      • Vars
        • S(g);OGATE::QAB(A)
        • S(g);SBLOCK::R(G)
      • Refutation
        • P(e);XP(D)
    • Try
      • S(H);
      • Vars
        • S(g);OGATE::QAB(A)
        • S(g);SBLOCK::R(G)
      • Refutation
        • P(e);XP(D)
    • Try
      • R(G);
      • Vars
        • S(g);OGATE,XR(G)::QAB(A)
        • P(e);N_GUARD,SBLOCK,XP(D)::S(C)
        • S(g);OGATE::QAB(A)
      • Refutation
        • S(g);
    • Try
      • R(G);
      • Vars
        • P(e);N_GUARD,SBLOCK,XP(D)::S(C)
        • S(g);OGATE::QAB(A)
      • Refutation
        • S(g);
    • Try
      • Q(A);
      • Vars
        • P(e);N_GUARD,SBLOCK,XP(D)::S(C)
        • S(g);SBLOCK::R(G)
        • S(g);N_GUARD::QAB(A)
      • Refutation
        • S(g);
  • Actual
    • K(B);N_PINR(b),P-FLIGHT
    • Vars
      • R(b);CHECK::QAB(A)+K(B),XR(b)
      • R(b);N_GUARD,SBLOCK,XP(D)::S(C)
      • R(b);OGATE,XP(E)::R1(G),XR(b)
      • P(e);N_GUARD,SBLOCK,XP(D)::S(C)
      • R(b);::QAB(A)+K(B),XR(b)
      • S(g);OGATE::QAB(A)
      • S(g);SBLOCK::R(G)
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