MESON Chess Problem Database

Problem Display
PID: 138311 (8/4N3/1p2p2p/1P2P2R/2ppk1p1/3p1p2/3B4/4NQ1K w - - 0 1)

Rice, John Michael

1st Prize, Problem Observer Block-Threat Ty., 2009-2010

8/4N3/1p2p2p/1P2P2R/2ppk1p1/3p1p2/3B4/4NQ1K

#2

8 + 9

56 The Problemist 2010
133 The Problemist Supplement 2017

SOLUTION

  • SOUND
  • Sets
    • 1...f2
      • 2.Qg2#
    • 1...c3
      • 2.Qxd3#
    • 1...g3
      • 2.Qxf3#
  • Tries
    • 1.Kg1?
      • 1...c3
        • 2.Qxd3#
      • 1...g3
        • 2.Qxf3#
      • 1...f2+!
    • 1.Kh2?
      • 1...f2
        • 2.Qg2#
        • 2.Qh1#
      • 1...c3
        • 2.Qxd3#
      • 1...g3+!
    • 1.Sc2?
      • threat
        • 2.Qe1#
      • 1...f2
        • 2.Qg2#
      • 1...dxc2!
    • 1.Sg2?
      • threat
        • 2.Qe1#
      • 1...fxg2+
        • 2.Qxg2#
      • 1...f2!
    • 1.Sxf3?
      • 1...gxf3
        • 2.Qe1#
      • 1...g3
        • 2.Rh4#
      • 1...c3!
    • 1.Bc1?
      • 1...c3
        • 2.Qxd3#
      • 1...f2
        • 2.Qg2#
      • 1...g3
        • 2.Qxf3#
      • 1...d2!
    • 1.Bxh6?
      • 1...c3
        • 2.Qxd3#
      • 1...f2
        • 2.Qg2#
      • 1...g3
        • 2.Qxf3#
      • 1...d2!
    • 1.Qg2?
      • threat
        • 2.Qxg4#
      • 1...g3
        • 2.Qxf3#
      • 1...fxg2+!
    • 1.Qh3?
      • threat
        • 2.Qxg4#
      • 1...g3
        • 2.Qg4#
        • 2.Qh4#
      • 1...gxh3!
    • 1.Qf2?
      • 1...g3
        • 2.Qxf3#
      • 1...c3!
  • Keys
    • 1.Sxd3!
      • threat
        • 2.Sf2#
      • 1...cxd3
        • 2.Qe1#
      • 1...f2
        • 2.Qe2#
      • 1...g3
        • 2.Rh4#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • P(b);OGATEB::QAB(B)
    • P(c);N_GUARD::QAB1(B),XP(a)
    • P(f);N_GUARD::QAB1(B),XP(b)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Vars
        • P(c);N_GUARD::QAB1(B),XP(a)
        • P(f);N_GUARD::QAB1(B),XP(b)
      • Refutation
        • P(b);CHECK
    • Try
      • K(C);P-FLIGHT
      • Vars
        • P(c);N_GUARD::QAB1(B),XP(a)
      • Refutation
        • P(f);CHECK
    • Try
      • S(A);
      • Threat
        • QAR(B)
      • Vars
        • P(b);OGATEB::QAB(B)
      • Refutation
        • P(a);XS(A)
    • Try
      • S(A);
      • Threat
        • QAR(B)
      • Vars
        • P(b);CHECK,OGATE,XS(A)::QAB(B),XP(b)
      • Refutation
        • P(b);
    • Try
      • S(A);XP(b)
      • Vars
        • P(f);SBLOCK,XS(A)::QAR(B)
        • P(f);OGATEB::R(G)
      • Refutation
        • P(c);
    • Try
      • B(D);
      • Vars
        • P(c);N_GUARD::QAB1(B),XP(a)
        • P(b);OGATEB::QAB(B)
        • P(f);N_GUARD::QAB1(B),XP(b)
      • Refutation
        • P(a);
    • Try
      • B(D);XP(i)
      • Vars
        • P(c);N_GUARD::QAB1(B),XP(a)
        • P(b);OGATEB::QAB(B)
        • P(f);N_GUARD::QAB1(B),XP(b)
      • Refutation
        • P(a);
    • Try
      • Q(B);P_PINP(b)
      • Threat
        • QAR2(B),XP(f)
      • Vars
        • P(f);N_GUARD::QAB1(B),XP(b)
      • Refutation
        • P(b);CHECK,N_SPINP(b),XQ(B)
    • Try
      • Q(B);
      • Threat
        • QAR2(B),XP(f)
      • Refutation
        • P(f);XQ(B)
    • Try
      • Q(B);
      • Vars
        • P(f);N_GUARD::QAB1(B),XP(b)
      • Refutation
        • P(c);
  • Actual
    • S(A);XP(a)
    • Threat
      • S(A)
    • Vars
      • P(c);SBLOCK,XS(A)::QAR(B)
      • P(b);N_GUARD::QAR2(B)
      • P(f);OGATEB::R(G)
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