MESON Chess Problem Database

Problem Display
PID: 133684 (2Rr4/1p4BB/2n5/NP2R1p1/1p1k3p/6qQ/4PPn1/1KN5 w - - 0 1)

Ravenscroft, Frank

The Field, 1961

(First published on Thu Nov 30 1961)

2Rr4/1p4BB/2n5/NP2R1p1/1p1k3p/6qQ/4PPn1/1KN5

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Kc3
      • 2.Rd5#
    • 1...Qxf2
      • 2.Scb3#
      • 2.Qd3#
    • 1...Qh2
      • 2.Scb3#
      • 2.Qd3#
    • 1...Qf4
      • 2.Scb3#
      • 2.Qd3#
    • 1...Qb3+
      • 2.Scxb3#
    • 1...Qd3+
      • 2.Qxd3#
    • 1...Qg4
      • 2.Scb3#
      • 2.Qd3#
    • 1...Sa7
      • 2.Rc4#
    • 1...Se7
      • 2.Rc4#
    • 1...Sb8
      • 2.Rc4#
  • Tries
    • 1.Scb3+?
      • 1...Kc3
        • 2.Re3#
        • 2.Rc5#
        • 2.Rd5#
      • 1...Qxb3+!
    • 1.Sab3+?
      • 1...Kc3
        • 2.Rc5#
      • 1...Kc4
        • 2.Rc5#
      • 1...Qxb3+!
    • 1.Rxc6?
      • threat
        • 2.Rc4#
      • 1...Qb3+
        • 2.Scxb3#
        • 2.Saxb3#
      • 1...Qd3+
        • 2.Qxd3#
      • 1...Qxe5
        • 2.Qd3#
      • 1...Qc3
        • 2.Rec5#
        • 2.Rxg5#
      • 1...Rc8
        • 2.Qd7#
      • 1...Se3
        • 2.Scb3#
        • 2.Sab3#
      • 1...bxc6!
    • 1.Rxd8+?
      • 1...Kc3
        • 2.Sa2#
        • 2.Re3#
        • 2.Rc5#
      • 1...Sxd8!
    • 1.Qd7+?
      • 1...Kc3
        • 2.Sa2#
        • 2.Re3#
        • 2.Rc5#
      • 1...Rxd7!
    • 1.Qxg3?
      • threat
        • 2.Scb3#
        • 2.Qd3#
      • 1...Sxa5
        • 2.Rec5#
        • 2.Rxg5#
        • 2.Qd3#
      • 1...Sxe5
        • 2.Qxe5#
        • 2.Qd3#
      • 1...Rd5
        • 2.Scb3#
      • 1...Se3
        • 2.Qxe3#
      • 1...Se1
        • 2.Scb3#
        • 2.Qe3#
      • 1...Sf4
        • 2.Scb3#
        • 2.Qe3#
      • 1...b3
        • 2.Scxb3#
        • 2.Qd3#
      • 1...hxg3!
  • Keys
    • 1.e4!
      • threat
        • 2.Rd5#
      • 1...Qb3+
        • 2.Scxb3#
      • 1...Qd3+
        • 2.Qxd3#
      • 1...Kc3
        • 2.Rd5#
      • 1...Qxe5
        • 2.Scb3#
      • 1...Sxe5
        • 2.Rc4#
      • 1...Rd5
        • 2.Rxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • K(d);P_SPINQ(b),P_SPINS(g),S_FLIGHT::B(I)+R(H)
    • Q(b);CHECK,N_GUARD::S(B),XQ(b)
    • Q(b);CHECK,OGATE::QAR1(E),XQ(b)
    • S(g);OGATE::R1(K)
  • Tries
    • Try
      • S(B);CHECK
      • Refutation
        • Q(b);CHECK,XS(B)
    • Try
      • S(F);CHECK
      • Vars
        • K(d);P_SPINQ(b),P_SPINS(g),S_FLIGHT::B(I)+R(H),DCHECK
        • K(d);P-FLIGHT,P_SPINS(g)::R1(H)
      • Refutation
        • Q(b);CHECK,XS(F)
    • Try
      • R(K);XS(g)
      • Threat
        • R1(K)
      • Vars
        • Q(b);CHECK,OGATE::QAR1(E),XQ(b)
        • Q(b);OGATE,P_SPINQ(b),XR(H)::QAR1(E)
        • R(i);N_GUARD::QAR(E)
      • Refutation
        • P(h);XR(K)
    • Try
      • R(K);CHECK,XR(i)
      • Refutation
        • S(g);XR(K)
    • Try
      • Q(E);CHECK
      • Refutation
        • R(i);XQ(E)
    • Try
      • Q(E);XQ(b)
      • Threat
        • DUALS(2)
      • Vars
        • R(i);::S(B)
        • S(a);N_GUARD::QAB1(E),XS(a)
      • Refutation
        • P(e);XQ(E)
  • Actual
    • P(C);
    • Threat
      • B(I)+R(H),DCHECK
    • Vars
      • Q(b);CHECK,N_GUARD::S(B),XQ(b)
      • Q(b);CHECK,OGATE::QAR1(E),XQ(b)
      • K(d);P_SPINQ(b),P_SPINS(g),S_FLIGHT::B(I)+R(H)
      • Q(b);N_GUARD,P_SPINQ(b),XR(H)::S(B)
      • S(g);OGATE,P_SPINS(g),XR(H)::R1(K)
      • R(i);::B(I)+R(H),DCHECK,XR(i)
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