MESON Chess Problem Database

Problem Display
PID: 592 (3Rb2n/K2p4/QPNk2p1/3P2R1/3P4/Nr1p2pB/3n4/6B1 w - - 0 1)

Bartlett, Ira A

The Observer, 1967

3Rb2n/K2p4/QPNk2p1/3P2R1/3P4/Nr1p2pB/3n4/6B1

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rxa3
      • 2.Qxa3#
    • 1...Rc3
      • 2.Sb5#
    • 1...Rb5
      • 2.Sxb5#
    • 1...Bf7
      • 2.Rxd7#
    • 1...Sb1
      • 2.Sc4#
    • 1...Sf1
      • 2.Sc4#
    • 1...Sf3
      • 2.Sc4#
    • 1...Sc4
      • 2.Sxc4#
    • 1...Se4
      • 2.Sc4#
    • 1...g2
      • 2.Bh2#
  • Tries
    • 1.Be3?
      • threat
        • 2.Bf4#
      • 1...Sf3
        • 2.Sc4#
      • 1...Sc4
        • 2.Sxc4#
      • 1...Sf7!
    • 1.Qa5?
      • threat
        • 2.Qc5#
      • 1...Rxa3
        • 2.Qxa3#
      • 1...Rc3
        • 2.Sb5#
      • 1...Rb5
        • 2.Sxb5#
      • 1...Se4
        • 2.Sc4#
      • 1...Rxb6!
  • Keys
    • 1.Qxd3!
      • 1...Rxa3+
        • 2.Qxa3#
      • 1...Rxd3
        • 2.Sb5#
      • 1...Rxb6
        • 2.Qxg3#
      • 1...Rb1
        • 2.Qxg3#
      • 1...Rb2
        • 2.Qxg3#
      • 1...Rc3
        • 2.Sb5#
      • 1...Rb4
        • 2.Qxg3#
      • 1...Rb5
        • 2.Sxb5#
        • 2.Qxg3#
      • 1...Bf7
        • 2.Rxd7#
      • 1...Sb1
        • 2.Sc4#
      • 1...Sf1
        • 2.Sc4#
      • 1...Sf3
        • 2.Sc4#
      • 1...Sc4
        • 2.Sxc4#
      • 1...Se4
        • 2.Sc4#
      • 1...Sf7
        • 2.Qxg6#
      • 1...g2
        • 2.Bh2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • R(b);OGATE,P_PINQ(G),XS(B)::QAB(G),XR(b)
    • R(b);N_GUARD::S(B)
    • R(b);N_GUARD::S(B),XR(b)
    • B(h);N_GUARD::R1(K),XP(g)
    • S(a);N_GUARD::S(B)
    • S(a);N_GUARD::S(B),XS(a)
    • P(d);OGATEB::B(A)
  • Tries
    • Try
      • B(A);
      • Threat
        • B(A)
      • Vars
        • S(a);N_GUARD::S(B)
        • S(a);N_GUARD::S(B),XS(a)
      • Refutation
        • S(i);
    • Try
      • Q(G);
      • Threat
        • QAB1(G)
      • Vars
        • R(b);OGATE,P_PINQ(G),XS(B)::QAB(G),XR(b)
        • R(b);N_GUARD::S(B)
        • R(b);N_GUARD::S(B),XR(b)
        • S(a);N_GUARD::S(B)
      • Refutation
        • R(b);XP(H)
  • Actual
    • Q(G);XP(c)
    • Vars
      • R(b);CHECK,OGATE,XS(B)::QAB(G),XR(b)
      • R(b);N_GUARD,XQ(G)::S(B)
      • R(b);N_GUARD,XP(H)::QAB(G),XP(d)
      • R(b);N_GUARD::QAB(G),XP(d)
      • R(b);N_GUARD::S(B)
      • B(h);N_GUARD::R1(K),XP(g)
      • S(a);N_GUARD::S(B)
      • S(a);N_GUARD::S(B),XS(a)
      • S(i);N_GUARD,S_CUTB(h)::QAR(G),XP(f)
      • P(d);OGATEB::B(A)
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